IOS SDK Assistant - "Failed to link the generated files to the Xcode project"

Hia

Using the SDK Assistant 3.1.301 - MacOS Mojave.

Trying to generate a project on a Olingo Service that previously worked but now it fails with the error.
"Failed to link the generated files to the Xcode project"

Happens on last step of the wizard, having selected Master Detail.

I can see that it creates the project behind the scenes - but cannot be opened (corrupt).

Any hints would be appreciated :D

/Allan