Compilation error: FreeRTOS.h: No such file or directory

This error message indicates that the compiler cannot find the FreeRTOS.h header file, which is necessary for compiling your code.

Here are some possible solutions:

1. Check that you have included the correct path for the FreeRTOS.h header file in your code.
2. Make sure that the FreeRTOS library is installed on your system and that the path to the library is included in your project settings.
3. If you are using an IDE, ensure that the FreeRTOS.h header file is included in the project files.
4. If you are using a makefile, check that the FreeRTOS.h header file is included in the source files.
5. If none of the above solutions work, try reinstalling the FreeRTOS library and make sure that it is properly installed on your system.