can't get oclhashcat to work

hi,

i have clean install of kali with all the driver needed and still im getting this error massage when tring to wpa brute force.

oclhashcat -m 2500 -a 3 --force /root/hs/sky18.hccap ?u?u?u?u?u?u?u?u
oclHashcat v1.30 starting...

Device #1: Tahiti, 2879MB, 1100Mhz, 32MCU

Hashes: 1 hashes; 1 unique digests, 1 unique salts
Bitmaps: 8 bits, 256 entries, 0x000000ff mask, 1024 bytes
Applicable Optimizers:
* Zero-Byte
* Single-Hash
* Single-Salt
* Brute-Force
Watchdog: Temperature abort trigger set to 90c
Watchdog: Temperature retain trigger set to 80c
Device #1: Kernel ./kernels/4098/m2500.Tahiti_1445.5_1445.5 (VM).kernel (259332 bytes)
Device #1: Kernel ./kernels/4098/markov_le_v1.Tahiti_1445.5_1445.5 (VM).kernel (94288 bytes)
Device #1: Kernel ./kernels/4098/bzero.Tahiti_1445.5_1445.5 (VM).kernel (30452 bytes)

[s]tatus [p]ause [r]esume [b]ypass [q]uit =>

tried oclhashcat benchmark test and got

oclHashcat v1.30 starting in benchmark-mode...

Device #1: Tahiti, 2864MB, 1100Mhz, 32MCU

STOP! Unsupported or incorrect installed GPU driver detected!
You are STRONGLY encouraged to use the official supported GPU driver for good reasons
See oclHashcat's homepage for official supported GPU drivers
You can use --force to override this but do not post error reports if you do so

used the --force command and it worked no problem.
please advice as i cant get any info on google

thanks