yes, i think double checking those settings is a good first move.
you would also want to check and see if your deploy went off without a hitch. if for some reason your project didn’t actually build and deploy, then you might see that page as well!
This Common Issue contains a ton of useful debugging tips that can likely help you solve your problem 
If you are still having problems, please do link us to a failed deploy (or paste the entire log here) and we’ll try and troubleshoot.