Q:

An error occurred while creating development build in xcode 9 beta

xcode beta 9 unable to create development build.As soon as i switch from app URL entry ,xcode throwing an error occurred popup.
What would be the problem here?
Attached image below.

A:

Finally i found a solution.Previous screen Development distribution options popup xcode asking for App thinning option, I have selected none it works. switching between Appthinnig and device varients fixed my problem.

