Manage libraries says it is installed yet when I try to compile the basic program for the Arduino Nano under check code. I get the error.
Here is the three lines of code I am using: #include <SPI.h> #include <nRF24L01.h> #include <RF24.h>
Are you certain of that? Maybe I am misinterpreting what you are showing here, but your screenshot shows that you have installed the "BTLE" library. That library does not contain files of this name:
So if you only have the "BTLE" library installed, this error is normal and expected.