Hawaii GPUs need modified kernels to continue working with the larger DAGs, we just haven't had the time to make it. For now you can use -clkernel 0 to use the generic kernels - they will be slower, and you also should set -mi 10 or -mi 11 to decrease the stale shares. Another option is to mine ETC, where the DAG is much smaller but with the current profitability you are probably better with mining ETH with generic kernels.