---- Minecraft Crash Report ----
// I feel sad now :(

Time: 9/11/18 1:18 PM
Description: Exception in server tick loop

j: Non [a-z0-9_.-] character in namespace of location: vorpalryu crafting adjusts:tags/items/red_sandstone_blocks.json
	at pw.<init>(SourceFile:35)
	at pw.<init>(SourceFile:47)
	at va.a(SourceFile:139)
	at vt.a(SourceFile:138)
	at vy.a(SourceFile:81)
	at xs.a(SourceFile:91)
	at xt.a(SourceFile:45)
	at vy.c(SourceFile:124)
	at vy.a(SourceFile:107)
	at net.minecraft.server.MinecraftServer.a(SourceFile:1398)
	at net.minecraft.server.MinecraftServer.a(SourceFile:393)
	at dmf.a(SourceFile:82)
	at dmf.d(SourceFile:107)
	at net.minecraft.server.MinecraftServer.run(SourceFile:548)
	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: 18w45a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 393163384 bytes (374 MB) / 603979776 bytes (576 MB) up to 2147483648 bytes (2048 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 0 / 8; []
	Data Packs: vanilla, file/afk display.zip (incompatible), file/anti enderman grief.zip (incompatible), file/customizable armor stands.zip (incompatible), file/double shulker shells.zip (incompatible), file/dragon drops elytra.zip (incompatible), file/more stairs crafting.zip (incompatible), file/redstone rotation wrench.zip (incompatible), file/renewable coral blocks.zip (incompatible), file/silence mobs.zip (incompatible), file/terracotta rotation wrench.zip (incompatible), file/treasure gems.zip (incompatible), file/universal dyeing.zip (incompatible), file/back to blocks.zip (incompatible), file/more mob heads.zip (incompatible), file/anti ghast grief.zip (incompatible), file/special rails adjust.zip (incompatible), file/12 trapdoors.zip (incompatible), file/4 bark blocks.zip (incompatible), file/cheaty uncrafting.zip (incompatible), file/craftable gravel.zip (incompatible), file/more bricks crafting.zip (incompatible), file/anti creeper grief.zip (incompatible), file/vorpalryu crafting adjusts.zip (incompatible)
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.