Unable to Preview in Studio with No Errors

I am currently completing the “Become a Rapid Developer” certification and have reached the point where I must preview the build I am creating. However, the preview button seems to be faded out and it says that I am unable to preview because the app did not pass consistency checks. When I click on the checks button, I receive the “All good!” message saying that no errors were found and my program is ready to be previewed. How do I resolve this?  Studio version is 2.0.862 and I am using the browser interface
1 answers

Hi James, 

I’ve got totally the same problem. consistency check never ends, even though the  console says “All good!”.

Once I returned to Developer portal, now the console doesn’t even say “All good”.

Seems many people have same problem.