[2021] CK III - A Javascript error occured in the main process

We now have reports of this on AVG, Avast and possibly Kaspersky.

You need to make sure all these apps are in its exceptions lists:

dowser.exe (in the Steam CK3 folder)
C:/users//AppData/Local/Programs/Paradox Interactive/launcher-v2.2020.16/paradox launcher.exe
C:/users//AppData/Local/Programs/Paradox Interactive/bootstrapper-v2.exe

Good luck!  

GholaTeg said: Hey Andrew, thanks for your prompt reply, I was busy and couldn't get back to you, however I do not have AVG, Avast, nor Kaspersky on my machine, so there was nothing to grant exceptions to. I can provide you with some logs, which ones would you be looking for in particular? Thanks!

Are you getting the exact same Java error seen in the OP here then? Or another Java error? or some other symptom entirely?

What AV app do you use?  

I see, so in fact your problem is nothing like the one discussed in this thread. In future can you please make a new thread of your own? Thanks.

Please try this:

- exit the Steam app entirely
- uninstall Paradox Launcher v2 from the Windows "Apps and features" utility, if still present.

Delete the following folders if still present:

- C:/users//AppData/Local/Programs/Paradox Interactive/
- C:/users//AppData/Local/Paradox Interactive/
- C:/users//AppData/Roaming/Paradox Interactive/launcher-v2/
To see the AppData folder you'll need to enable View Hidden Items in File Explorer.

- run steam.exe as the Windows Admin user

- run the game from the PLAY button in Steam

IF that doesn't help, in this folder are some .log files:
C:/users//AppData/Local/Paradox Interactive/launcher-v2/
Please attach them here.