There was an update earlier this week that affecting caching on the site. Some people may be having issues connecting to the site and are getting Application Errors when logging in.
If you are getting Application Errors when trying to log onto N4G, please do the following:
1. Clear your cache and all cookies associated with N4G for all time.
2. Completely close out your browser.
3. Go back and log back in.
This should fix your issue. But, make sure that #1 is for all time. Only 4 weeks may not be enough.
This is the same on mobile, but you might have to look up how to do it on some browsers like Samsung browser or the like.
Additionally, if none of this works for you right now, going incognito and logging in that way will always work since it doesn't cache data or cookies in that mode.