I imported another file that is not aix

Guys, I imported an extension and just imported another file that is not aix and now, when I try to open the project, the message appears An internal error has occurred. Report an error?
How do I fix this error?

First of all, please change your post category to Discuss.
And,

If your app is still in development, and you’re getting this error while importing Extensions, then ignore the error message and refresh your tab.
Else if you’re getting this error on APK, then let us know what Extension and file you’ve imported.