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Arduino Web Editor #521
but I had this errors messages while compiling :
However, I can upload this same code from my desktop IDE arduino 1.8.3 without any problems.
So I don't understand why it is not working when I use Arduino Web Editor. The Web Editor works well with others codes.
Also I don't understand why it found multiple libraries, I have only one in the libraries manager (from Arduino Web Editor).
The Arduino team made the questionable decision to make all Arduino Web Editor users unknowing beta testers for the new arduino-preprocessor tool. Unfortunately that tool is still a little rough around the edges. One of the outstanding issues is that function prototype generation is broken for any sketch which includes the FastLed library:
The workaround is to manually add function prototypes to your sketch.
Because all libraries in the Library Manager index are pre-installed in the Arduino Web Editor and FastLED is in the Library Manager index.