FTB: Infinity server keeps crashing during startup

[Reflex_Donutz]

I host a FTB: Infinity Evolved server for me and my friends and since we last played, the server keeps crashing during startup everytime. I ended de server normally by using /stop and didn't alter the server after that whatsoever. Here is a pastebin of the crashlog: http://pastebin.com/8Ti7hsas

 

[phit]

looks like one of the vanilla json files (usercache.json, usernamecache.json, whitelist.json, ops.json, banned-ips.json, banned-players.json) is corrupted/badly formatted
try backing them up and then start the server without them