TypeError: Error #1009 on Screen

Hi,
I have this error(TypeError: Error #1009 ) after open screen(Split Panel and Tab Control, 4 Screen sections). Screen is working fine only show this error on opening. Any Idea what is it mean?
Thanks

Can you please attach a log that is displayed along with the error message?

I changed datastructure and it solved the error. Sorry I have not the log with this error.