!!!CRITICAL PROBLEM - I can't edit any element in gridbox editor.

Hi, a very strange issue.
Yesterday I could without any problems work on the site, edit everything etc. Nothing was installed, no code was added, nothing.
Today I can't edit any kind of element on the site. Even a page structure window or Theme popup will not appear. I tried on chrome, edge and firefox. Deleted all cache, restarted my pc...nothing...And in edge console are some js critical errors shown....Please help!

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