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I had the exact same problem a while ago. Originally my database name is data_xoopstest, but everytime I try to submit it I get the same error message that you get. So what I did was I entered data_xoopstest2 (data_xoopstest2 is not yet created) and I get the same error message, THEN I entered the original database name data_xoopstest that I created earlier. POOF! it works! This is from a fresh install.