The issue you are facing does not always have to do with the Discord app. So, you must look for issues within your device as well.
Alternatively, you can proceed with the following steps right away for an immediate solution
The Discord error on your device might indicate a temporary error in the app. So, you might want to address that issue first. Restarting the app can help you fix various errors while you use it. Close Discord for a minute on your device and then relaunch it.
Also, close any Discord processes that you find running in the background on your PC. Even if this method works, it might not always ensure a long-term solution.
Restart Your Device
Do you find the app running without any issues after doing this? If yes, you can apply this solution again if the error occurs anytime soon. But, that would not be enough if there is an installation issue with Discord.
Use a Different Device to Run Discord
Scan Your Device for Malware
Launch your antivirus software and scan your device for malicious files. Remove any malware you find on your device immediately. You should then be able to run Discord without any issues. If you cannot, you must consider the antivirus app as the cause of the persisting error.
Disable the Antivirus Program
Launch Discord after disabling the antivirus to check on the problem. If the error appears again, it might have nothing to do with your antivirus. Yet, you must keep your antivirus disabled while trying other possible solutions.
Open Discord as Administrator
Right-click the Discord app icon and opt for running it as an administrator. This should grant more permissions to the app than it had otherwise. As a result, you might not face any further problems in running Discord on your PC.
Clear Discord Data and Regenerate it
Clearing the app data is often sufficient for fixing the error. Make sure to stop all Discord processes running on your device before doing that.
Find the Discord app data folder on your device and remove all of it. Using a mobile device, you can quickly clear app data through Settings. Restart your device and launch Discord to regenerate all the deleted data. You might find this method to be quite effective in many cases.
But, what if the update fails to fix the error? In that case, reinstalling the app might be the only viable solution.