Did you try it a second time?
It works on my machine ;-)
I am also getting the error I just started the training today I tried then waited a couple of hours and tried again – same issue.
Hit create App – the screen with “We are building your app” comes on then a pop up widget..
An error ocurred while executing microflow
If you click [ok] it comes back a few times and is then unresponsive.
Hi – I am experiencing the same error – might be a problem with the mendix servers and we have to wait till it is cleared