Problem with install AuctionPress

After install wordpress and auctionpress theme I recevied error. I set the theme properly but when I open auction i recived somethin like that: (on line: 266 When I jump to My account sesion I see only: Access denied for user ‘user’@’localhost’ (using password: NO) on line: 249

Can you help me with that? Maybe it’s wrong php or WordPress version (I try on older but the result’s is still the same).