Minecraft is crashed if i try to create a world in assorted mode.

 Here in the crash report

— Minecraft Crash Report ----
// Sorry

Time: 28.03.19 14:45
Description: Exception in server tick loop

n: Non [a-z0-9/._-] character in path of location: minecraft:cye$a$a@776535b0
at qr.<init>(SourceFile:38)
at qr.<init>(SourceFile:43)
at bxs.m(SourceFile:100)
at ve.a(SourceFile:164)
at bgv.<init>(SourceFile:129)
at ve.<init>(SourceFile:164)
at net.minecraft.server.MinecraftServer.a(SourceFile:378)
at dwo.a(SourceFile:82)
at dwo.d(SourceFile:104)
at net.minecraft.server.MinecraftServer.run(SourceFile:603)
at java.lang.Thread.run(Unknown Source)

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: 19w13a
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_201, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 493579440 bytes (470 MB) / 1219801088 bytes (1163 MB) up to 3425959936 bytes (3267 MB)
JVM Flags: 5 total; -Xmn128M -Xmx3280M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -XX:+UseConcMarkSweepGC
Player Count: 0 / 8; []
Data Packs: vanilla
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.