Deleting the Discord data folders is the most common fix for Discord JavaScript errors when trying to start up the application. Essentially, you'll be deleting what could be corrupt or broken ...

After deleting the second Discord folder, relaunch the Discord setup file and follow the onscreen instructions to re-install the program. Second solution: Rule out security tools.

Re-register the JavaScript dll file. Reinstall Skype, Discord, etc, app that is having problems. Now let’s see how you can apply this solution (s) in practice.