TypeError: xml is null!!!

TypeError: xml is null!!!

Dear friends, I have discover that part of code of script of one of my apps has disappeared.

Form 'RESULTADOS' (displayname '08-RESULTADOS') has a lot of action script events, but now, I'm able to see 'without action' code only... When I select 'On Add->On Success', or directly 'With Action' in Script UI, error message 'TypeError: xml is null' appears...

I'm very worried about it, and I shared my aplication to support in order to get the aproppiate help.

Thanks in advance.