IDE 1.6.8

This is the error i am getting, downloaded new version, had 1.6.6, everything was working yesterday.

C:\Users\MYNAME\AppData\Local\Temp\build68b0be7f5406ade87e4da19dc1699c75.tmp/core\core.a(Tone.cpp.o): In function `__vector_13':

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Tone.cpp:539: multiple definition of `__vector_13'

libraries\NewPing\NewPing.cpp.o:C:\Users\MYNAME\Documents\Arduino\libraries\NewPing/NewPing.cpp:284: first defined here

c:/program files (x86)/arduino/hardware/tools/avr/bin/../lib/gcc/avr/4.8.1/../../../../avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.