Mysql exception:dbname.ISNULL function does not exist. This error actually srewed me a lot. I did lot of google but the search result were not help full. I manage to solve this error. Below is my findings that may helpfull. I have store procedure where I used ISNULL very often and even other procedures. But only one procedure was showing this Error. For this first check in procedure if there is "Enter" immediate after ISNULL then remove it. If function is used in the procedure check the same in function too. This will resolve the issue :)