Forge Server giving "incomplete set of tags" error and also says "incompatible vanilla server"

[Vander]

I'm new to stuff like this. I'm trying to host a server for my friends using Hamachi. After following the instructions to create a server, it seems to go completely fine, but when I shut down the server then restart it, it gives these errors.

I copied the world to the saves folder and entered it in singleplayer, and all of the Create items I had placed and that were in chests were gone. I could still craft and place new ones.

I don't know what the problem is, can anyone help?

Edited April 11, 2021 by Vander
More clarification

[Vander]

The first file is for the server, second is for the client.

debug.log debug.log