ERROR: clGetPlatformIDs() -1001

[mahdi24]

hi every one
i have an error in oclHashcat-plus32.exe

i use from hashcat on desktop pc with windows 7 and i have a ati radeon 6870 graphic card and i install catalyst 13.5

but when i run oclHashcat-plus32.exe and enter this command :

Code:

C:\hashcat\oclHashcat-plus>oclHashcat-plus32.exe -m 2500 -a 3 capture.hccap ?u?u
?u?u?u?u?u?u

i see this error :

Code:

ERROR: clGetPlatformIDs() -1001

i cant find any solution for windows desktop station

what can i do ?
plz help me

and im sry for my bad language
im iranian and my lang is persian
im so sorry