You've really supplied the least information possible. When you post add in the OS version and a little about what you are trying to do, rather than strictly the result. With that said, I'll try a guess:
PP Version 15 and AE Version 18 go together and make up 2021 versions. The message somehow says 2020?
You can try renaming the DynamicLinkMediaServer folder, contained in this folder:
Paste the below line into File Explorer:
Just rename it with maybe an x as the first letter. Do it with both PP and AE closed, then fire it up and try it again...