Trouble with RF24 library

RonaldRuijtenberg · July 10, 2022, 11:31am

Hello, I'm having trouble getting a simple RF24 program working. During compilation I keep getting all kind of error messages about missing or wrong statements in libraries NRF24 an/on nRF24L01. I've searched and read but have not come anywhere near a solution. I have attached the (extensive) error messages and the code. Any help will be greatly appreciated.`
(I hope the code and errors are readable.

/* This version 20220710
   feel free to copy (as I did many times)
   questions ? contact me !
    Ronald Ruijtenberg (ronald.ruytenberg@planet.nl)
*/
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

RF24 radio(9, 10); // CE, CSN

const byte address[6] = "00001";     //Byte of array representing the address. This is the address where we will send the data. This should be same on the receiving side.
int button_pin = 2;
boolean button_state = 0;

void setup() {
  pinMode(button_pin, INPUT);
  radio.begin();                  //Starting the Wireless communication
  radio.openWritingPipe(address); //Setting the address where we will send the data
  radio.setPALevel(RF24_PA_MIN);  //You can set it as minimum or maximum depending on the distance between the transmitter and receiver.
  radio.stopListening();          //This sets the module as transmitter
}

void loop()
{
  button_state = digitalRead(button_pin);
  if (button_state == HIGH)
  {
    const char text[] = "Your Button State is HIGH";
    radio.write(&text, sizeof(text));                  //Sending the message to receiver
  }
  else
  {
    const char text[] = "Your Button State is LOW";
    radio.write(&text, sizeof(text));                  //Sending the message to receiver
  }
  radio.write(&button_state, sizeof(button_state));  //Sending the message to receiver

  delay(1000);
}

Arduino:1.8.13 (Windows 10), Board:"Arduino Uno"

C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Gebruiker\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Gebruiker\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Hobby\Arduino I\libraries -fqbn=arduino:avr:uno -ide-version=10813 -build-path C:\Users\GEBRUI~1\AppData\Local\Temp\arduino_build_171537 -warnings=none -build-cache C:\Users\GEBRUI~1\AppData\Local\Temp\arduino_cache_78151 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino

C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Gebruiker\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Gebruiker\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Hobby\Arduino I\libraries -fqbn=arduino:avr:uno -ide-version=10813 -build-path C:\Users\GEBRUI~1\AppData\Local\Temp\arduino_build_171537 -warnings=none -build-cache C:\Users\GEBRUI~1\AppData\Local\Temp\arduino_cache_78151 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino

Using board 'uno' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr

Using core 'arduino' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr

Detecting libraries used...

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o nul -DARDUINO_LIB_DISCOVERY_PHASE

Alternatives for SPI.h: [SPI@1.0]

ResolveLibrary(SPI.h)

  -> candidates: [SPI@1.0]

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o nul -DARDUINO_LIB_DISCOVERY_PHASE

Alternatives for nRF24L01.h: [nRF24L01 NRFLite@3.0.3]

ResolveLibrary(nRF24L01.h)

  -> candidates: [nRF24L01 NRFLite@3.0.3]

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "-IC:\\Hobby\\Arduino I\\libraries\\nRF24L01" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o nul -DARDUINO_LIB_DISCOVERY_PHASE

Alternatives for RF24.h: [RF24]

ResolveLibrary(RF24.h)

  -> candidates: [RF24]

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "-IC:\\Hobby\\Arduino I\\libraries\\nRF24L01" "-IC:\\Hobby\\Arduino I\\libraries\\RF24" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o nul -DARDUINO_LIB_DISCOVERY_PHASE

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "-IC:\\Hobby\\Arduino I\\libraries\\nRF24L01" "-IC:\\Hobby\\Arduino I\\libraries\\RF24" "C:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src\\SPI.cpp" -o nul -DARDUINO_LIB_DISCOVERY_PHASE

Generating function prototypes...

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "-IC:\\Hobby\\Arduino I\\libraries\\nRF24L01" "-IC:\\Hobby\\Arduino I\\libraries\\RF24" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\preproc\\ctags_target_for_gcc_minus_e.cpp" -DARDUINO_LIB_DISCOVERY_PHASE

"C:\\Program Files (x86)\\Arduino\\tools-builder\\ctags\\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\preproc\\ctags_target_for_gcc_minus_e.cpp"

Sketch aan het compileren...

"C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10813 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\standard" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\SPI\\src" "-IC:\\Hobby\\Arduino I\\libraries\\nRF24L01" "-IC:\\Hobby\\Arduino I\\libraries\\RF24" "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp" -o "C:\\Users\\GEBRUI~1\\AppData\\Local\\Temp\\arduino_build_171537\\sketch\\Sending_data_NRF24_20220710_1.ino.cpp.o"

In file included from C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino:9:0:

C:\Hobby\Arduino I\libraries\RF24/RF24.h:2:18: error: stray '\342' in program

 Search or jump to…

                  ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:2:19: error: stray '\200' in program

 Search or jump to…

                   ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:2:20: error: stray '\246' in program

 Search or jump to…

                    ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:8:1: error: stray '@' in program

 @RonaldRuijtenberg

 ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:22:1: error: stray '@' in program

 @2bndy5

 ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:23:30: error: stray '#' in program

 2bndy5 Add isFifo() methods (#849)

                              ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:24:1: error: stray '\342' in program

 …

 ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:24:2: error: stray '\200' in program

 …

  ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:24:3: error: stray '\246' in program

 …

   ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:1: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

 ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:8: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

        ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:18: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                  ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:25: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                         ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:35: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                   ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:45: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                             ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:53: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                     ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:65: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                                 ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:74: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                                          ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:80: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                                                ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:88: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                                                        ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:28:108: error: stray '@' in program

 @TMRh20@maniacbug@2bndy5@gcopeland@Avamander@akatran@soligen2010@mz-fuzzy@komby@dstroy0@zador-blood-stained@wmarkow

                                                                                                            ^

C:\Hobby\Arduino I\libraries\RF24/RF24.h:1:1: error: 'Skip' does not name a type

 Skip to content

 ^~~~

In file included from C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino:9:0:

C:\Hobby\Arduino I\libraries\RF24/RF24.h:98:3: error: 'rf24_pa_dbm_e' does not name a type

 } rf24_pa_dbm_e;

   ^~~~~~~~~~~~~

In file included from C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino:9:0:

C:\Hobby\Arduino I\libraries\RF24/RF24.h:1790:28: error: 'rf24_pa_dbm_e' has not been declared

     void startConstCarrier(rf24_pa_dbm_e level, uint8_t channel);

                            ^~~~~~~~~~~~~

C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino: In function 'void setup()':

Sending_data_NRF24_20220710_1:21:20: error: 'RF24_PA_MIN' was not declared in this scope

   radio.setPALevel(RF24_PA_MIN);  //You can set it as minimum or maximum depending on the distance between the transmitter and receiver.

                    ^~~~~~~~~~~

C:\Hobby\Arduino Master\NRF24\Sending_data_NRF24_20220710_1\Sending_data_NRF24_20220710_1.ino:21:20: note: suggested alternative: 'RF24_SPI_PTR'

   radio.setPALevel(RF24_PA_MIN);  //You can set it as minimum or maximum depending on the distance between the transmitter and receiver.

                    ^~~~~~~~~~~

                    RF24_SPI_PTR

Meerdere bibliotheken gevonden voor "nRF24L01.h"

Gebruikt: C:\Hobby\Arduino I\libraries\nRF24L01

Niet gebruikt: C:\Hobby\Arduino I\libraries\NRFLite

Bibliotheek SPI op versie 1.0 in map: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\SPI  wordt gebruikt

Bibliotheek nRF24L01 in map: C:\Hobby\Arduino I\libraries\nRF24L01 (legacy) wordt gebruikt

Bibliotheek RF24 in map: C:\Hobby\Arduino I\libraries\RF24 (legacy) wordt gebruikt

exit status 1

'RF24_PA_MIN' was not declared in this scope

UKHeliBob · July 10, 2022, 11:33am

Welcome to the forum

Please post the full sketches that you are having problems with, using code tags when you do, and also the full error messages copied from the IDE using the "Copy error message" button and put those in code tags too

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

robrs · July 10, 2022, 12:24pm

Hi RonaldRuijtenberg,

It looks like you have omitted the following Include within your sketch -

#include <RF24_config.h>

HTH?

RonaldRuijtenberg · July 10, 2022, 3:06pm

Tried it but alas I keep getting a lot of this : 'error: stray '@' in program' and this :
error: 'rf24_pa_dbm_e' does not name a type
and I haven't got a clue of where to resolve this. Thx for your swift reply though.

groundFungus · July 10, 2022, 3:17pm

Do you have the latest version of the rf24 (TMR24) library installed?

Copy the code from your original post and compile it. I did and it compiles fine. The "stray" stuff is from your copying the code form a web page with embedded HTML. When you post the code in code tags that stray crap is removed by the forum software.

RonaldRuijtenberg · July 10, 2022, 5:32pm

I tried but get the same errors. Where can I get the TMR24 library ? I tried Github but there it says : We couldn’t find any repositories matching 'TMR24'

groundFungus · July 10, 2022, 6:12pm

This is the version that you should install. RF24 by TMR20

I just again tried copying the code from the original post into the IDE and it compiles with no warnings or errors.

RonaldRuijtenberg · July 10, 2022, 9:08pm

I have just that :

![image|690x387](upload://wypqPkjsqlMEpknr4I5UvxgATMR.png)

but with a (major ?) difference : by you is says 'by TMRh20.Avamander version 1.4.3 INSTALLED.  
By me it is only 'by TMRh20' 
There is a button 'Install' 
When I click that I get 'Library RF24 is already installed in: C:\Hobby\Arduino I\libraries\RF24' 
I tried to make a printscreen but did not get it right.  Hope my text is clear enough.

RonaldRuijtenberg · July 11, 2022, 11:56am

I think I am one step further after installing the RF24.h from RF24-master.zip.
The 'only' error now is : ''pipe' was not declared in this scope'
Is this something that has to be declared in my code ?

UKHeliBob · July 11, 2022, 12:47pm

Which sketch causes that error ?

RonaldRuijtenberg · July 11, 2022, 1:06pm

The one in my initial post.
When I add this line directly under RF24 radio(9,10)
'const uint64_t pipe = 0xE8E8F0F0E1LL;'
I get 'undefined reference to `RF24::' for each statement in my code that begins with radio.

UKHeliBob · July 11, 2022, 1:08pm

The code in your original code compiles OK for me with no changes

RonaldRuijtenberg · July 11, 2022, 2:35pm

Then where is the difference ? The library or what ?

groundFungus · July 11, 2022, 2:42pm

I suggest that you navigate to your Arduino sketchbook libraries folder
( ... \Documents\Arduino\libraries), find and delete the rf24 library that is there and then use the library manager to install the rf24 library by TMR20 (shown in the image in post #8.

Then you should have the latest version of the correct library correctly installed. I have copied and pasted the code from the OP into my IDE (version 1.8.19) and successfully compiled the code at least 4 times.

What version of the IDE are you using?

UKHeliBob · July 11, 2022, 2:53pm

Let's compare the libraries

Do your RF24 examples look like this ?

If so, then open the RF24 GettingStarted example

With the sketch open select "Sketch/Show sketch folder" in the IDE

Navigate up the Windows file tree until you get to the RF24 folder and open the RF24.h file. The first line in mine is

Copyright (C) 2011 J. Coliz maniacbug@ymail.com

What is the first line of your RF24.h file ?

RonaldRuijtenberg · July 11, 2022, 5:38pm

RonaldRuijtenberg · July 11, 2022, 5:45pm

Furthermore I have NO RF24 examples in Files/Examples.
I guess that I have a correct library but in the wrong place.

RonaldRuijtenberg · July 11, 2022, 5:55pm

This did it !
The code compiled without errors !
I can start testing now.
Thanks a lot for helping me out !
Ronald Ruijtenberg

groundFungus · July 11, 2022, 5:56pm

Cool. Have fun!

UKHeliBob · July 11, 2022, 5:56pm

Have you got examples now ?

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