Error: BEGIN failed--compilation aborted

An often important general rule is that the first error message is usually the one that you want to pay attention to. The error message you quoted above is not the first error message you got. It is a follow-on error message that notes a consequence of the previous error and one that is particularly unenlightening here.

Please look at the first error message and it'd probably be good to reply to your node with the exact text of that first error message so the rest of us don't have to guess at what error you got (though, my guess is that you didn't declare the $override variable while you were smart enough to use strict, but that is just a guess -- further, I guess that you should just drop the [$override]s from your code).