at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:559) ~[Loader.class:?]
        at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99) ~[FMLServerHandler.class:?]
        at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:328) ~[FMLCommonHandler.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:121) ~[lh.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:442) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
[10:04:35] [Server thread/ERROR]: This crash report has been saved to: /root/minecraftserver/./crash-reports/crash-2017-05-31_10.04.35-server.txt
[10:04:35] [Server thread/INFO]: Stopping server
[10:04:35] [Server thread/INFO]: Saving worlds
[10:04:35] [Server thread/WARN] [FML]: Can't revert to frozen GameData state without freezing first.
[10:04:36] [Server thread/INFO] [FML]: The state engine was in incorrect state CONSTRUCTING and forced into state SERVER_STOPPED. Errors may have been discarded.
[10:04:36] [Server Shutdown Thread/INFO]: Stopping server
> 2017-05-31 10:04:36,107 ERROR Attempted to append to non-started appender File