Where error is hiding?

I have maid some changes in my qtpyvcp GUI. When I try to load this GUI in linuxcnc it halts.
Where problem could be? Does it possible to see where to look from this Error messeges?
   
 

Have you removed the numberGroup? That's what is being complained about which suggests some attribute that used to be there and was being reference has either been removed or is now nested somewhere that it can not be referenced.

Cheers - j,

Yes, thanks I found this problem also.
There was such situation when I moved sub-screen to another place accidentally. When I saw it I moved it back, but possibly references lost.

I'm not so good (rather bad) in QtDeveloper, but is it possible to lock elements from moving if they are finished?

Un fortunately not that I am aware of. Ctrl-z is you friend.

GUI screen was bigger than that I used for editting, so I didn't see when I made such operation. It was too late when I see.