Xcode 9 - Could not attach to pid for Frameworks unit tests

Question

I am getting the following error after migrating from one mac to another using time machine.

Could not attach to pid

Ensure "project title"

Answer 1

Haven't seen this exact error, but I've found removing the derived data helps fix some transient errors that pop up after updates etc.

You can find the location of your derived data folder in Xcode.
Open preferences/locations and click the arrow.
Once in derived data you can remove all the folders. FYI after deleting the derived data folder all your projects will need to be rebuilt.

Hope this helps!