Java Error Error from Companion: java.lang.RuntimeException: invalid syntax in eval form: :8:1: caught exception in inliner for # - java.lang.RuntimeException: no such class:

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Hello, I have the same problem with any extension I install (Error from Companion: java.lang.RuntimeException: invalid syntax in eval form: :63:1: caught exception in inliner for # - java.lang.RuntimeException: no such class:). I'm using Windows 10 + Chrome. I have just installed the AppInventor 2 software, so it is updated.

Could anyone help me?

Got this error "java.lang.RuntimeException: no such class" when import extension