The blocks category isn't loading properly!

When I was continuing my project, There was a pop-up that said "The blocks area did not load properly. Changes to the blocks for screen 5610212518920192_Screen1 will not be saved"
I tried to reload the page and the same thing happens! Please fix this!

Please send your project's .aia file.

Did you uninstall an extension prior this happened, if so

You can reload mit and sign and out again to solve or simply troubleshoot at hel