Can't Edit screens in Kodular : Error Occured

I had integrated StartApp Ad Extension in my app project, when I removed the extension some blocks were left may be,… and When i reloaded the page and opened the page, i was not able to Edit y project, 3 of its show following error when i try to edit them

The option to delete screen is also disabled, i cant even delete screens, so that i cant restore screen backup

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load your lastest backup and restart from there
see also MIT App Inventor 2 Tips – TWO DOG APPS