This is the full strack trace:
g: Non [a-z0-9/._-] character in path of location: minecraft:CaveSpider
at ns.<init>(SourceFile:36) ~inecraft_server.17w50a.jar:?]
at ns.<init>(SourceFile:41) ~inecraft_server.17w50a.jar:?]
at aru.g(SourceFile:42) ~inecraft_server.17w50a.jar:?]
at aru.b(SourceFile:185) ~inecraft_server.17w50a.jar:?]
at bbf.a(SourceFile:86) ~inecraft_server.17w50a.jar:?]
at bds.a(SourceFile:287) ~inecraft_server.17w50a.jar:?]
at bds.a(SourceFile:124) inecraft_server.17w50a.jar:?]
at rn.c(SourceFile:141) inecraft_server.17w50a.jar:?]
at rn.a(SourceFile:160) inecraft_server.17w50a.jar:?]
at ro.a(SourceFile:871) inecraft_server.17w50a.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:425) inecraft_server.17w50a.jar:?]
at net.minecraft.server.MinecraftServer.j_(SourceFile:450) inecraft_server.17w50a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:544) inecraft_server.17w50a.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Linked issues
duplicates 1
Comments 2
Also, this is on a world that was carried over from 1.8 (from 2014). I start the snapshot server, connect with the 18w03b client (but same happens in 18w02a too), teleport to 764 100 1888 and then the server crashes with that exception.
The jar is called 17w50a, but it's actually 18w03b renamed to 17w50a because of MineOS.