JSON - "Exception in server tick loop"

If your server doesn’t start and presents the following error, it’s usually because there’s an issue with your ops.json and whitelist.json files.

java.lang.NullPointerException: Exception in server tick loop at

net.minecraft.server.v1_7_R3.JsonList.load(JsonList.java:171)

How to fix the “Exception in server tick loop” error

1. Stop your server from the Console page
2. Click File Manager
3. Delete ops.json, whielist.json, and usercache.json
4. Start your server