mysql help - to fix some little errors

Hello, im looking for help to fix some mysql errors, well i find the error line but is not working, is for a site for cellphones, if you help me i would thank $$ you.

is mysql and php,

for example, i get this error on my log:

Problem during Record update, contact admin <-
API Response is STATUS: PROCESSED

and this is the code where gives error:

function update($table,$update,$condition){
$conn=$this->connect();
$query="update " . $table ." set " . $update ." where " . $condition;
$res=mysql_query($query);

if(!$res){
echo "Problem during Record update, contact admin";
} else {
return true;
}

}//end update()