Player Data is what is tied to a Player on a Minecraft Server, This data can sometimes become corrupted or cause issues preventing the player from joining the server. This guide will show you how to reset a Players data.
We will be using a website called NameMC - Search for the players In Game Name & click on their profile. In some cases, you may need their first UUID displayed. However, in other instances you may need the second one.
1. Login to the Kinetic Panel
2. Head to the File Manager
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3. Now, head to the World Folder. You can find the name of your world folder under "Settings > World File".
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4. Open the folder called "Player Data"
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5. You can search for the Players data by using the UUIDs, in this example, it was the first UUID listed on NameMC.
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6. You can delete that Players UUID and then reboot the server.
The "uuid.dat_old" is an older version of that users playerdata, it won't be loaded unless re-named to just .dat.