My levels don't show in UE 4.27

I have installed the new engine version 4.27, I copied my entire project from 4.26 and it works fine, but the levels I have been working on in 4.26 don’t appear and I can’t import them. Some solutions would be appreciated. Thanks!

I have the same problem. It converted 5 levels, but the sixth it wouldn’t… even though it brought in all the assets. Was due to a static mesh problem, but still haven’t got to the bottom of it, but will let you know if I ever do.