ERROR: clGetDeviceIDs() -1
i'm running windows 7 64bit, have stream 2.1 and cat 10.7 installed, gpu is hd5850 and i get the following error

C:\***\oclHashcat-0.22>oclHashcat.exe example.hash ?l?l?l?l example.dict
oclHashcat v0.22 starting...

Digests: 6494 entries, 6494 unique
Platforms: 1
ERROR: clGetDeviceIDs() -1

what could be the problem? let me know if you need more information
thanks in advance
i guess the problem could be that no monitor was attached to the gpu .. will try it again later
yeah ati cards must be connected to monitor... did it work?
works now, nice tool, thanks