Win32::ODBC is using AutoLoader, which means that if you call subroutines in that package that don't exist, it will try to load the code for them from an .al file. So something you are doing is erroneously trying to call Win32::ODBC::mySql.

(Update after seeing others posts: AutoLoader is dumb. The "Can't locate ... .al" error can mean an improper installation, or it can mean someone calling a sub that doesn't exist at all.)