I can't seem to import any of the addons! I've given an example of what happens when I try. It's shown in the photos. For the example I tried importing the addon I wanted, which is called the "Vanish Addon". The three pictures where one of my world resource and behavior packs' are shown is to prove that I don't already have the Addon on Minecraft.

This started happening two days ago, on May 19th of 2020.