why am i getting this error???????

each time i tried to open a post/thread today i got this error message.........

Warning: mysql_query() [function.mysql-query]: [COLOR=#009900 !important]Access denied[/COLOR] for user 'nobody'@'localhost' (using password: NO) in [path]/includes/class_postbit.php(289) : eval()'d code on line 2

Warning: mysql_query() [function.mysql-query]: A [COLOR=#009900 !important]link to[/COLOR] [COLOR=#009900 !important]the server[/COLOR] could not be established in [path]/includes/class_postbit.php(289) : eval()'d code on line 2

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in [path]/includes/class_postbit.php(289) : eval()'d code on line 3

can the admin or somebody help in this regard plz??

thanks in advance