App inventor can't load my project

I keep trying to load my project but i get two error messages. First one says "Attempted to create second instance of ...hiddencomponent" but i couldn't capture it fully. The second one says: "Unable to find component "CustomListView" while loading project "ClassChecker_Screen_checkpoint1"."

I removed an extension called CustomListView, after that the project just won't load. I tried to export it but it didn't work. Then I exported "all projects" and I was able to find the aia file in the download list.

Okay I followed the help here and managed to retrieve my project.

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