My server keeps crashing!!!!

Whenever i go onto my server, it lets me on for like a minute then it stops and shows me a message saying, Internal Exception: java.io.IOException: connection reset by peer

here is my server log: https://mclo.gs/ajTSHW6

How do you do that?

I reseted the player data and everything seemed to be working, but after a few hours it happened again. We dont want to keep reseting the player data because we dont want to keep loosing our stuff. What should we do??