Issue in installing Arduino unit library and running with Firmata test application I am trying to update the Arduino library via the library manager and I tried to download it from the link given in the firmata_test program:


  WARNING: Category '' in library ArduinoUnit is not valid. Setting to
  'Uncategorized'
  C:\Users\SAURAB~1\AppData\Local\Temp\arduino_c8217a5b56c170d64dfe4c80a1a205dc\firmata_test.ino:
  In member function 'virtual void test_beginPrintsVersion::once()':
  
  C:\Users\SAURAB~1\AppData\Local\Temp\arduino_c8217a5b56c170d64dfe4c80a1a205dc\firmata_test.ino:32:3:
  warning: narrowing conversion of '249' from 'int' to 'char' inside { }
  [-Wnarrowing]
  
  };
  
  ^
  
  Multiple libraries were found for "Firmata.h"  Used:
  C:\Users\saurabh2836\Documents\Arduino\libraries\Firmata  Not used:
  C:\Program Files (x86)\Arduino\libraries\Firmata


I'm getting this error. I searched but found no conclusive answer. I'm using Windows 8 64bit and Firmata downloaded from http://www.firmata.org/.

Am I doing something wrong?
The compiler is giving a lot of information. The warnings can be ignored but the "multiple libraries" indicates that there is at least two copies of Firmata installed. Check (search) that you have not got several downloads of Firmata. Worst case reinstall to clean up that. 

Cheers!