---- Minecraft Crash Report ----
// Oops.

Time: 4/2/17 4:31 AM
Description: Exception in server tick loop

java.lang.RuntimeException: Failed to check session lock, aborting
at bbt.i(SourceFile:64)
at bbt.<init>(SourceFile:50)
at bbq.<init>(SourceFile:21)
at bbr.a(SourceFile:84)
at net.minecraft.server.MinecraftServer.a(SourceFile:246)
at lh.j(SourceFile:229)
at net.minecraft.server.MinecraftServer.run(SourceFile:436)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
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– System Details –
Details:
Minecraft Version: 1.11.2
Operating System: Linux (amd64) version 2.6.32-042stab120.18
Java Version: 1.8.0_121, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2000297264 bytes (1907 MB) / 2058354688 bytes (1963 MB) up to 2058354688 bytes (1963 MB)
JVM Flags: 2 total; -Xmx2048M -Xms2048M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 0 / 10; []
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)