---- Minecraft Crash Report ---- // You should try our sister game, Minceraft! Time: 10/26/17 12:40 PM Description: Exception in server tick loop java.lang.StringIndexOutOfBoundsException: String index out of range: -2 at java.lang.String.substring(String.java:1967) at nt.a(SourceFile:141) at qf.a(SourceFile:116) at nt.<init>(SourceFile:61) at oo.b(SourceFile:165) at chw.a(SourceFile:101) at chw.j(SourceFile:133) at net.minecraft.server.MinecraftServer.run(SourceFile:467) at java.lang.Thread.run(Thread.java:745) A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- System Details -- Details: Minecraft Version: 17w43b Operating System: Mac OS X (x86_64) version 10.12.6 Java Version: 1.8.0_74, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 175299880 bytes (167 MB) / 268435456 bytes (256 MB) up to 2147483648 bytes (2048 MB) JVM Flags: 7 total; -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 Profiler Position: N/A (disabled) Player Count: 0 / 8; [] Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.