Custom mod pack crashing just before world gen

[SolidMercury]

I am making a custom mod pack for me and some friends but it's crashing and i have no idea why. when preparing for world generation it will go to "saving world" for a few second before crashing and giving this error:

 

The game crashed whilst mouseclicked event handler Error: com.electronwill.nightconfig.core.io.WritingException: An I/O error occured

 

https://pastebin.com/W2tP4HJY the full chash report

[warjort]

Quote

Caused by: java.nio.file.FileSystemException: C:\Users\Ewan\curseforge\minecraft\Instances\Cozy Pack\config\sophisticatedcore-common.toml: The process cannot access the file because it is being used by another process

Looks like something is locking that file. e.g. you are editing it, or an instance of minecraft is still running.

Edited January 16, 2023 by warjort

[SolidMercury]

I was sure i had no instances of MC open but just to be safe i restarted mt pc and only opened forge to launch the modpack, same crash as before... any idea as to what would cause it otherwise ?

[warjort]

Could be a mod doing something weird (a bug) with its configuration file.

Check you have the latest version then contact the mod author.

 

Also in the past, errors like that file lock are sometimes misinterpreted by the java virtual machine.

e.g. It could be an issue with the operating system permissions of the file stopping it opening the file. But java misreports the error as it being locked. 

Or it would probably be more accurate to say Windows is telling java the wrong error code?

 

Try deleting the file. Minecraft/Forge will recreate it with default values. 

[SolidMercury]

is there a simple way to figure out what mod is causing it or am i gonna have to try them 1 by 1 ?

 

[warjort]

The file is for sophisticated core which is used by sophisticated backpacks.

Maybe others? https://www.curseforge.com/minecraft/mc-mods/sophisticated-core/relations/dependents?filter-related-dependents=3