500 Internal Server Error when import Extension

When I import an extension, it gives me the error.
In Edge DevTools, it gives me these errors.
Now I can't upload any extensions.
Thanks for help.

Try to use Google Chrome of Firefox.

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I try to use Chrome, it gives me the same error. The Edge is the latest version(Chromium).

Import an extension from local file, not a url ?

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I import a URL, it gives me the error. I import an extension from local file, it gives me the error too.

I think the extension may be incompatible with your version of App Inventor, or perhaps it got corrupted during the download - worth trying the download again.

Definitely do not use the Edge Browser, it's not 100% compatible with App Inventor even though it is now based on Google Chrome.

Can you tell us the name of the extension and the URL please LiuLyxAndy.

Also, long shot, clear your Browser cache (FireFox, don't use Edge).

The 500 Internal Server Error is a general http status code that means something has gone wrong on the website’s server, but the server could not be more specific on what that exact problem is. It is rare but not impossible that the issues with the computers that connect to the server are triggering this error.