[MC Server Does not start when launched]

Have had a tekkit legends server running from my personal computer for a few weeks now. Suddenly its saying this when trying to start,

 

[Server thread/INFO]: Starting minecraft server version 1.7.10
[Server thread/INFO]: Loading properties
[Server thread/INFO]: Default game type: SURVIVAL
[Server thread/INFO]: Generating keypair
[Server thread/INFO]: Starting Minecraft server on *:25565
[Server thread/ERROR]: Encountered an unexpected exception
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated array at line 1 column 16
    at com.google.gson.Gson.fromJson(Gson.java:818~[Gson.class:?]
    at com.google.gson.Gson.fromJson(Gson.java:768~[Gson.class:?]
    at net.minecraft.server.management.UserList.func_152679_g(SourceFile:125) ~[om.class:?]
    at net.minecraft.server.dedicated.DedicatedPlayerList.func_152619_x(SourceFile:91) ~[ls.class:?]
    at net.minecraft.server.dedicated.DedicatedPlayerList.<init>(SourceFile:27) ~[ls.class:?]
    at net.minecraft.server.dedicated.De