crash report(actually in 20w12a, this won't let me)

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Shall we play a game?
Time: 3/25/20 2:08 PMDescription: Ticking player
java.lang.IllegalArgumentException: Cannot get property cdt

as it does not exist in Block{minecraft:dark_oak_wall_sign} at cct.c(SourceFile:93) at btc.a(SourceFile:58) at ccu$a.d(SourceFile:691) at bib.a(SourceFile:171) at bib.a(SourceFile:364) at bhw.a(SourceFile:452) at bbp.j(SourceFile:290) at bbq.l(SourceFile:575) at amy.h(SourceFile:2175) at bbq.h(SourceFile:274) at yi.i(SourceFile:411) at yz.b(SourceFile:198) at lv.a(SourceFile:234) at yy.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:872) at net.minecraft.server.MinecraftServer.a(SourceFile:799) at ekh.a(SourceFile:129) at net.minecraft.server.MinecraftServer.run(SourceFile:658) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at cct.c(SourceFile:93) at btc.a(SourceFile:58) at ccu$a.d(SourceFile:691) at bib.a(SourceFile:171) at bib.a(SourceFile:364) at bhw.a(SourceFile:452) at bbp.j(SourceFile:290) at bbq.l(SourceFile:575) at amy.h(SourceFile:2175) at bbq.h(SourceFile:274)
– Player being ticked --Details: Entity Type: minecraft:player (yi) Entity ID: 4 Entity Name: BalaramChakra Entity's Exact location: 62.70, 77.00, 284.70 Entity's Block location: World: (62,77,284), Chunk: (at 14,4,12 in 3,17; contains blocks 48,0,272 to 63,255,287), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Entity's Momentum: 0.00, 0.00, 0.00 Entity's Passengers: [] Entity's Vehicle: ~_ERROR~ NullPointerException: nullStacktrace: at yi.i(SourceFile:411) at yz.b(SourceFile:198) at lv.a(SourceFile:234)
– Ticking connection --Details: Connection: lv@f3dea23Stacktrace: at yy.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:872) at net.minecraft.server.MinecraftServer.a(SourceFile:799) at ekh.a(SourceFile:129) at net.minecraft.server.MinecraftServer.run(SourceFile:658) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 20w12a Minecraft Version ID: 20w12a 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: 1363284320 bytes (1300 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB) CPUs: 4 JVM Flags: 8 total; -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Player Count: 1 / 8; [yi['BalaramChakra'/4, l='expiriment of mods and glitchesx', x=62.70, y=77.00, z=284.70]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.