I got this error in my 1.8.9 minecraft server while using server.pro and i don't know how to fix it any ides?

I got this error in my 1.8.9 minecraft server while using server.pro and i don't know how to fix it any ides? I got this error in my 1.8.9 minecraft server while using server.pro and i don t know how to fix it any ides

Eissah 03.03.2018

Help me xd and I meant any ideas*

Eissah 03.03.2018

Go to your world folder and find the player data and delete it

Guest 03.03.2018