I am pretty new to JUCE and I find all the tutorials that the JUCE staff made available extremely useful. I am learning a lot from them. Thanks guys.
So i believe is good practice to report small errors/typos that may produce compile errors, to save other learners from wasting time like a just did to find the bug.
here it is:
in the MainContentComponent.cpp file of the project, the line 156 reads as follows
void handleNoteOff (MidiKeyboardState*, int midiChannel, int midiNoteNumber, float /*velocity*/) override
but the pure virtual function that is here being implemented takes three arguments only. So just replace line 156 with the following
void handleNoteOff (MidiKeyboardState*, int midiChannel, int midiNoteNumber) override
and you'll compile straight away.
Hope this can help someone and that more tutorials are on their way.