UltraLiteJ Error [-280] Publication Not Found

I was synchronizing my native app (only 1 MBO) with no problem. Now, i've added 2 new MBO's. As i dont want to synchronize 3 MBO's at the same time i separated my MBO's in 2 especific Sinchronization Groups.

I was using XXXDB.synchronize(); with no problem, now i'm using XXXDB.synchronize("SYNC_GROUP_NAME"); and im getting this message:

UltraLiteJ Error [-280] Publication 'SYNC_GROUP_NAME' not found.

Anyone has any idea how to solve this?

Thanks.