This happened because publishing your index page in the abvfp folder has overwriten the ABVFPindex page. After that, you deleted also this index page, and at this point, the server doesn't find one and displays the folder content.
It would have been enough uploading again ONLY the ABVFP index page from your ABVFP zip extracted files (on your computer) into the ABVFP folder in your computer.

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