java.lang.IncompatibleClassChangeError while ticking entity

---- Minecraft Crash Report ----
// Don't do that.

Time: 7/14/19 6:09 PM
Description: Ticking entity

java.lang.IncompatibleClassChangeError
	at ql.b(SourceFile:100)
	at ql.a(SourceFile:117)
	at ail.b(SourceFile:2022)
	at ail.h(SourceFile:388)
	at aiu.h(SourceFile:2046)
	at aiv.h(SourceFile:294)
	at aun.h(SourceFile:51)
	at vi.a(SourceFile:580)
	at vi$$Lambda$2683/1353121950.accept(Unknown Source)
	at bhm.a(SourceFile:676)
	at vi.a(SourceFile:383)
	at net.minecraft.server.MinecraftServer.b(SourceFile:824)
	at net.minecraft.server.MinecraftServer.a(SourceFile:763)
	at dxo.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:631)
	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 thread
Stacktrace:
	at ql.b(SourceFile:100)
	at ql.a(SourceFile:117)
	at ail.b(SourceFile:2022)
	at ail.h(SourceFile:388)
	at aiu.h(SourceFile:2046)
	at aiv.h(SourceFile:294)
	at aun.h(SourceFile:51)
	at vi.a(SourceFile:580)
	at vi$$Lambda$2683/1353121950.accept(Unknown Source)

-- Entity being ticked --
Details:
	Entity Type: minecraft:skeleton (auy)
	Entity ID: 1643
	Entity Name: ~~ERROR~~ IncompatibleClassChangeError: null
	Entity's Exact location: 27.56, 73.00, 2.23
	Entity's Block location: World: (27,73,2), Chunk: (at 11,4,2 in 1,0; contains blocks 16,0,0 to 31,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at bhm.a(SourceFile:676)
	at vi.a(SourceFile:383)

-- Affected level --
Details:
	All players: 1 total; [vj['Nemchi'/197, l='NW', x=-19.58, y=77.00, z=5.85]]
	Chunk stats: ServerChunkCache: 6241
	Level dimension: minecraft:overworld
	Level name: NW
	Level seed: 82815873
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-48,63,16), Chunk: (at 0,3,0 in -3,1; contains blocks -48,0,16 to -33,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 19585 game time, 19585 day time
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 33434 (now: false), thunder time: 7305 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:824)
	at net.minecraft.server.MinecraftServer.a(SourceFile:763)
	at dxo.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:631)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.14.3
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 563158576 bytes (537 MB) / 1979711488 bytes (1888 MB) up to 2147483648 bytes (2048 MB)
	JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [vj['Nemchi'/197, l='NW', x=-19.58, y=77.00, z=5.85]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.