I wanted to disable my datapack, but i accidentally disabled the vanilla datapack. Now it seems that my world crashes when i load into the game.

I do have signs in my world, some are clickable, which teleport you to places and give you advancements.

This is my crash log:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// This is a token for 1 free hug. Redeem at your nearest Mojangsta: _HUG~
Time: 12/30/18 11:18 AMDescription: Rendering Block Entity
java.lang.IllegalArgumentException: Cannot get property bqh

as it does not exist in Block{minecraft:oak_sign} at bpl.c(SourceFile:95) at dgi.a(SourceFile:49) at dgi.a(SourceFile:24) at dgb.a(SourceFile:151) at dgb.a(SourceFile:131) at dee.a(SourceFile:696) at dea.b(SourceFile:968) at dea.a(SourceFile:877) at dea.a(SourceFile:751) at cpk.d(SourceFile:910) at cpk.b(SourceFile:394) at net.minecraft.client.main.Main.main(SourceFile:154)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Client threadStacktrace: at bpl.c(SourceFile:95) at dgi.a(SourceFile:49) at dgi.a(SourceFile:24)
– Block Entity Details --Details: Name: minecraft:sign // bom Block: Block{minecraft:oak_sign}[rotation=10,waterlogged=false] Block location: World: (46,36,-6), Chunk: (at 14,2,10 in 2,-1; contains blocks 32,0,-16 to 47,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1) Block: Block{minecraft:oak_sign}[rotation=10,waterlogged=false] Block location: World: (46,36,-6), Chunk: (at 14,2,10 in 2,-1; contains blocks 32,0,-16 to 47,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)Stacktrace: at dgb.a(SourceFile:151) at dgb.a(SourceFile:131) at dee.a(SourceFile:696) at dea.b(SourceFile:968) at dea.a(SourceFile:877)
– Affected level --Details: Level name: MpServer All players: 1 total; [ddl['KdotDevelopment'/13, l='MpServer', x=49.50, y=36.00, z=-9.50]] Chunk stats: MultiplayerChunkCache: 1089, 841 Level seed: 0 Level generator: ID 01 - flat, ver 0. Features enabled: false Level generator options: {} Level spawn location: World: (-5,151,-5), Chunk: (at 11,9,11 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Level time: 184418 game time, 6000 day time Level dimension: 0 Level storage version: 0x00000 - Unknown? Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false) Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false Forced entities: 8 total; [amr['Sheep'/0, l='MpServer', x=3.05, y=36.00, z=28.77], amr['Sheep'/1, l='MpServer', x=15.12, y=36.00, z=27.14], amm['Pig'/2, l='MpServer', x=-11.58, y=36.00, z=-42.68], ddl['KdotDevelopment'/13, l='MpServer', x=49.50, y=36.00, z=-9.50], amm['Pig'/3, l='MpServer', x=16.39, y=36.00, z=-45.75], amm['Pig'/4, l='MpServer', x=26.41, y=36.00, z=-44.18], amm['Pig'/5, l='MpServer', x=19.45, y=36.00, z=-49.76], amr['Sheep'/6, l='MpServer', x=2.13, y=36.00, z=28.12]] Retry entities: 0 total; [] Server brand: vanilla Server type: Integrated singleplayer serverStacktrace: at dbi.a(SourceFile:367) at cpk.b(SourceFile:1928) at cpk.b(SourceFile:402) at net.minecraft.client.main.Main.main(SourceFile:154)
– System Details --Details: Minecraft Version: 18w50a 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: 965543848 bytes (920 MB) / 1879048192 bytes (1792 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 Launched Version: 18w50a LWJGL: 3.1.6 build 14 OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4358, Intel GL Caps: Using GL 1.3 multitexturing.Using GL 1.3 texture combiners.Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.Shaders are available because OpenGL 2.1 is supported.VBOs are available because OpenGL 1.5 is supported.
Using VBOs: Yes Is Modded: Probably not. Jar signature remains and client brand is untouched. Type: Client (map_client.txt) Resource Packs: vanilla Current Language: English (US) CPU: 4x Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz

I also wanna redeem my free hug: _HUG~