If you're also facing the
Gmail Error (#500) on your system on Gmail, then you don't have to worry about anything because, with the help of the below steps of clearing the cache and cookies of your browser, you can easily fix these issues in no time.
1) Open your browser and go to the settings.
2) The, search for cache & cookies.
3) Now you'll find a clear cache and cookies option from which you can remove them.
4) Clear all the cookies and then restart your browser once.
5) Now, try to login to your Gmail Account, you'll see that it will be working perfectly! 
