Getting a lot of "low lifficulty shares" warnings...

I use r9 390.
start.bat:

SETX GPU_MAX_ALLOC_PERCENT 100
SETX GPU_USE_SYNC_OBJECTS 1
SETX GPU_FORCE_64BIT_PTR 1

optiminer  -s zec-eu.suprnova.cc:2142 -u login.worker -p mypw

pause

Pool registers 0 H/s.

What am I doing wrong?