If you find your server not starting up with the following error:
java.lang.NullPointerException: Exception in server tick loop at net.minecraft.server.v1_13_R3.JsonList.load(JsonList.java:171)
This means there is an issue with one of your ops.json/whitelist.json files.
To fix this, do the following:
1. Stop your server
2. Access your servers files using FTP and delete the ops.json, whitelist.json and usercache.json files
3. Start your server
If any information you see here is outdated please let us know by creating a support ticket. Thank you.
