invalid handler 'onLockChanged'?

[Art Wendorf]

Getting an error that I just can't figure out. UGH! I know that it's being triggered by my Theme, but darn it!

Script Error: [string ""]:1: attempt to set a value for an invalid handler 'onLockChanged'

[Trenloe]

Some info here: https://www.fantasygrounds.com/forums/showthread.php?53616-script-error-with-custom-skin&p=474565&viewfull=1#post474565

And here: https://www.fantasygrounds.com/forums/showthread.php?52288-Error-ruleset&p=464043&viewfull=1#post464043