Welcome to community. Official language is English so next time please follow the rules. As for your problem in order to import a screen / ais, in order to avoid such problems, you must have imported all extensions used in that screen to your project before importing screen.
In order to delete that screen you have to download project/aia, open it with 7zip, go to src folder, locate problematic bky and scm files and delete them. After that upload aia again to creator