Unknown Error in studio->Opportunities->Layouts->EditView

Hi,

I want to add one custom field in Opportunity EditView.
So I Went to admin page->studio->Opportunities->Layouts->EditView. There I’m seeing error popup window I don’t know why it’s coming…
and I don’t know what error it is…
I’ve attached Error screen shot.
please help me to resolve this problem…

Hi,

Could you try the following:

Go to Admin > Repair and run “Quick Repair & Rebuild”
On the page that appears, scroll down and click “Execute” if it shows.

Then, Go to Admin > Repair and run “Rebuild JS Grouping Files”

After this has finished, go to Admin > Repair and run “Quick Repair & Rebuild” again.
and again, Click “Execute” if it appears.

Then, clear your browser’s cache.

Does this help resolve the error?

again same error coming quick repair and rebuild is not solving that error.
this error only coming in opportunity module. other modules editview, detail view working fine…
only EditView & DetailView is problem in Opportunity module…