Check the box for "Reinstall Server" and click "Save Settings and Restart Game Server" at the bottom of the page; as soon as I did that, the server started up for me. Took a couple minutes for it to be "Ready" though, so give it time. Would be nice if they put out some information on how to fix the issue instead of customers having to troubleshoot and help others with the fix.
How do I connect directly to my ARK server, since I can't seem to find anywhere on the Control panel page to connect that way. I used to have a batch file I ran to do it back years ago, but it's been so long since I've done any batch files, I totally forgot how to redo it.