yes, i get this error message
Error in server response
: {"id":1,"jsonrpc":"2.0","error":{"code":-1,"message":"invalidaddressorusernameusedforlogin"}}
try this code
set GPU_FORCE_64BIT_PTR 0
set GPU_MAX_HEAP_SIZE 100
set GPU_USE_SYNC_OBJECTS 1
set GPU_MAX_ALLOC_PERCENT 100
set GPU_SINGLE_ALLOC_PERCENT 100
NsGpuCNMiner -o stratum+tcp://xmr-eu.dwarfpool.com:8050 -u AAAAAAAAAA.BBBBBBBBBB.1111 -p x -o stratum+tcp://xmr-usa.dwarfpool.com:8050 -u AAAAAAAAAA.BBBBBBBBBB.1111 -p x
AAAAAAAAAA=ur wallet address
BBBBBBBBBB=ur payment id
1111= ur workername
ghostfaceuk gave me this code he help me alot here is his profile
https://bitcointalksearch.org/user/ghostfaceuk-916334