.h no such file or directory

Hello, I am Florian and I have a big problem with my Arduino. Every time I would like to include a library
this error is printed.
If someone has a good idea, please write to me!

SR04_Example:3:10: fatal error: SR04.h: No such file or directory

#include <SR04.h>

^~~~~~~~

compilation terminated.

exit status 1
SR04.h: No such file or directory

Have you installed the SR04 library and if so how did you do it ?

First I took the library out of the Arduino files (add zip file). Then I got it from the sketch / include library / manage library/ and installed one.

This is the program:

#include <SR04.h>
#define TRIG_PIN 12
#define ECHO_PIN 11
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long a;

void setup() {
Serial.begin(9600);
delay(1000);
}

void loop() {
a=sr04.Distance();
Serial.print(a);
Serial.println(“cm”);
delay(1000);
}

What is the full path to the library ?

Is there a possible confusion between capital O and the digit 0 somewhere in the names ?

No it is a 0 and not a O.
And when I would like to install a library this error comes:
Invalid library found in C:\Users\Florian KURZ\Documents\Arduino\libraries\arduino_267030: no headers files (.h) found in C:\Users\Florian KURZ\Documents\Arduino\libraries\arduino_267030

Delete the C:\Users\Florian KURZ\Documents\Arduino\libraries\arduino_267030 folder unless it means something to you and/or contains something that you want. If so move it elsewhere before starting the IDE again

I made the mistake of including the library, now it works. Thanks for help!