Welcome, @doubletreeusainc!
Since the application error is usually just a browser glitch, try logging in through a private or incognito window first—that usually does the trick. Also, use a supported browser for the best experience.
If it’s still acting up, give steps 2 and 3 in this troubleshooting guide a quick look: Troubleshooting browser problems.
Should you need more help, let us know in the comments.