WebUI won't start a 1.13 server

(I know I got at bit detaily there BTW ;))

The full message is “Cannot start server without designated JAR”
There are two things you can try then:

  1. select (in your minecraft servers page) another profile, then reselect the 1.13 profile.
    * this should force a recopy of the downloaded profile jar
  2. press the “Transfer profile files” button to force a recopy from the profiles to your server.

Then reselect the correct JAR in the JAR dropdown menu. Wait a few seconds to make sure the selected JAR stays selected. If not, select it again. Repeat until it stays selected. If it refuses you can manually edit the “server.config” file in/var/games/minecraft/servers/[servername]/. It should read “jarfile=minecraft_server.1.13.jar”

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