Vertcoin mining help

[usao]

Im trying to GPU mine with vertcoin-0.5.2. I entered my pool details in the vertcoin.conf file, but when I start vertcoin using all the default parameters in the vertcoin.conf file supplied with the software all I get is GPU failure, disabling.
Not sure where to turn for assistance.
The GPU is a R9-280x and works fine when mining alt coins with cgminer.