(EDIT: THIS IS A CLIENT-SIDED ISSUE, THIS HAPPENS WHEN JOINING ANY SERVER)

I have been currently having this issue where if I join my server, I get one of these 2 errors.
I have tried fixing this issue by looking at the output log in both Server and Client side, from what I have seen I was not able to find anything I can understand that would have helped me.
These two errors pop up randomly with no pattern when attempting to join the server when it says Encrypting...
I have tried removing all mods from the Client and Server side, which did nothing and still showed the same errors (I don't remember which error showed or even if it showed both), so from what I tried to do, I do not think this is a mod Issue but rather a Forge Issue.

How do I fix this?
Here are the errors and all the information:

Internal Exception: java.lang.NoClassDefFoundError: com/google/common/util/concurrent/TrustedListenableFutureTask
Debug.log: https://www.mediafire.com/file/hbtycb1tamqt1qr/debug2.log/file
(PS: Debug.log file cannot be uploaded to Pastebin due to it crashing because of the Large Amount of Spam OpenGL logs)


Internal Exception: Internal Exception: java.lang.NoClassDefFoundError: com/google/common/collect/LinkedHashMultiMap$ValueSet
Debug.log: https://www.mediafire.com/file/o1d48z0bjfyff1e/debug.log/file
(PS: Debug.log file cannot be uploaded to Pastebin due to it crashing because of the Large Amount of Spam OpenGL logs)


Client Mods:


Server Mods:

Edited March 1, 20241 yr by invis7

Maybe it refers to the OpenGL error spam

Make a test without Rubidium and Oculus

Internal Exception: java.lang.NoClassDefFoundError: com/google/common/util/concurrent/TrustedListenableFutureTask
Did not work.

Remove mods one by one until you find the one, causing this issue

With no Mods on both server and client side, the error still happens.
Internal Exception: Internal Exception: java.lang.NoClassDefFoundError: com/google/common/collect/LinkedHashMultiMap$ValueSet

Maybe it is something outside Minecraft - make a test with disabled Firewall and Antivirus program

I currently have Kaspersky Anti-Virus Premium, maybe I will test it without it .

@TileEntity
It didn't work with the antivirus disabled.
Internal Exception: Internal Exception: java.lang.NoClassDefFoundError: com/google/common/collect/LinkedHashMultiMap$ValueSet.

Do you think that this issue can be solved if, instead of locally hosting it, maybe hosting on a cloud service provider.

Is the server using Java 17? Check the server log for this version

@TileEntity
Java is 21

starting: java version 21.0.1 by Oracle Corporation; OS Windows 11 arch amd64 version 10.0

Make a test with Java 17

Same thing. 85% of the time it doesn't let me in

Add the new server log

BIG DISCOVERY!!!!:
WHEN I ATTEMPT TO JOIN HYPIXEL IT SHOWS THE SAME ERROR! SO THIS IS A CLIENT ISSUE. 
 

So add the new client log

https://www.mediafire.com/file/uqyb56kmsznxytr/the.log/file @TileEntity
Sorry for late response

(PS: the log is too big to upload to any paste website!)

Something is still causing an OpenGL error - maybe the spam causes this issue

Then whats the issue thats causing it?

I have no idea - maybe a driver issue

So what am I supposed to do to fix a driver issue.

Check for Intel/Nvidia driver updates

 

If there is no change, maybe a mod is conflicting with the CPU/GPU or some OpenGL features of it

 

Maybe make a test with a similar large modpack and check if there are the same issues

Latest.log https://pastebin.com/raw/K6aDtAFR
Im in the latest driver, no OpenGL issue.

Clean Forge install, at my 4th attempt I get this error.
No Mods, No Setting. Clean and I still get the error.

Internal Exception: Internal Exception: java.lang.NoClassDefFoundError: com/google/common/collect/LinkedHashMultiMap$ValueSet.

I have no idea - maybe an issue with the internet or java or something similar

 

java.lang.NoClassDefFoundError: com/google/common/net/InetAddresses
...
java.lang.NoClassDefFoundError: com/google/common/util/concurrent/NullnessCasts

 

This Issue is extremely annoying as I could not find anything online about both issues. So what do we do here?
I will update my network drivers.

well nothing worked.

@TileEntity