Rotary encoder midi!

Using Arduino Audio
6

The library said midi give these mistakes:

C:\Users\...\Documents\Arduino\libraries\MIDI_controller\Analog.cpp: In constructor 'Analog::Analog(byte, byte, byte, byte)':

C:\Users\...\Documents\Arduino\libraries\MIDI_controller\Analog.cpp:11:6: error: 'dPin' was not declared in this scope

   if(dPin < A0 || dPin > A5){ //If the user enters an invalid pin number. 

      ^

exit status 1
Error compiling for board Arduino/Genuino Uno.