Minecraft: help is important (programming)?

How can I rewrite this message or turn it off right away?

You can find out which plugin is to blame
You decompile the code or search the code on the Internet
You use Ctrl + F to search for "? 8World saved."
You fix it
You export the plugin and add it to your plugins

For everyone who has the same problem:

You can simply delete the message in the Spigot.jar.conf file. It stands behind "WorldSavedCommand =."

Just behind = = remove everything.