crash report

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 31/07/21 4:31 PM
Description: Unexpected error

java.lang.IllegalStateException: Already building!
	at dfh.a(SourceFile:215)
	at ecu$c.a(SourceFile:302)
	at ecu$c.a(SourceFile:225)
	at ecu$c$b.a(SourceFile:507)
	at ecu$c$b.a(SourceFile:434)
	at ecu$c.k(SourceFile:399)
	at ecu.a(SourceFile:181)
	at eae.a(SourceFile:979)
	at eae.a(SourceFile:1131)
	at dzz.a(SourceFile:727)
	at dzz.a(SourceFile:546)
	at djz.e(SourceFile:1048)
	at djz.e(SourceFile:681)
	at net.minecraft.client.main.Main.main(SourceFile:215)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
	at dfh.a(SourceFile:215)
	at ecu$c.a(SourceFile:302)
	at ecu$c.a(SourceFile:225)
	at ecu$c$b.a(SourceFile:507)
	at ecu$c$b.a(SourceFile:434)
	at ecu$c.k(SourceFile:399)
	at ecu.a(SourceFile:181)
	at eae.a(SourceFile:979)
	at eae.a(SourceFile:1131)
	at dzz.a(SourceFile:727)

-- Affected level --
Details:
	All players: 3 total; [dzm['Pikachu_1298'/12, l='ClientLevel', x=-4.53, y=89.79, z=-7.42], dzn['zwakman'/21, l='ClientLevel', x=-1.80, y=89.77, z=14.92], dzn['Aviva'/9, l='ClientLevel', x=-32.28, y=95.00, z=-0.56]]
	Chunk stats: Client Chunk Cache: 18225, 441
	Level dimension: minecraft:overworld
	Level spawn location: World: (-2,118,5), Chunk: (at 14,7,5 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 171813 game time, 6000 day time
	Server brand: Waterfall <- Paper
	Server type: Non-integrated multiplayer server
Stacktrace:
	at dwt.a(SourceFile:449)
	at djz.c(SourceFile:2239)
	at djz.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:215)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
	Minecraft Version: 1.16.5
	Minecraft Version ID: 1.16.5
	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: 340736728 bytes (324 MB) / 1073741824 bytes (1024 MB) up to 1073741824 bytes (1024 MB)
	CPUs: 16
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Launched Version: 1.16.5-Impact_4.9.1
	Backend library: LWJGL version 3.2.2 build 10
	Backend API: Radeon RX 5500M GL version 4.6.14741 Compatibility Profile Context 21.7.1 27.20.22017.1004, ATI Technologies Inc.
	GL Caps: Using framebuffer using OpenGL 3.0
	Using VBOs: Yes
	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Graphics mode: fabulous
	Resource Packs: vanilla
	Current Language: English (US)
	CPU: 16x AMD Ryzen 7 4800H with Radeon Graphics