EHD6420OR: clBuildProgram() -11

[qweasd]

I am getting this error on an HD6420. command line being used is:

Code:

oClhashcat-plus64.exe -m 2500 -a 3 clear.hccap ?d?d?d?d?d?d?d?d?d?d
pause

32-bit version also shows the same error.

This is on Windows 7 64-bit with AMD drivers 12.11 if that helps.