Mega not recognised (I think)

Development Tools IDE 1.x
1

Hi,
I think my Arduino is not recognised this message is showing each time I try to verify a project.

Arduino : 1.8.5 (Mac OS X), Carte : "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

fork/exec /Users/garethcharlton/Desktop/Arduino.app/Contents/Java/tools-builder/ctags/5.8-arduino11/ctags: bad CPU type in executable

Compilation error for arduino Mega or Mega 2560

Thank you if you help me.