I found a work round. I set the mapNode PhysicsBody to nil before the add child. I have no idea where the PhysicsBody was set in the first place.

I have tried using an empty SpriteKitScene file and get same crash.

Is this something to do with what I am seeing in the scene. I wanted to attach a screenshot here to show the scene where the only items appearing in the scene inventory panel are the ground elements textures I drag from the asset library. There is no inventory of the tiles that have been used as shown in the graphics and that are editable after I double click the Tile Map Node. Is there anywhere I can see those? Also is the exception to do with the contents of the Tile Map Node itself? And how do I add a screenshot in a comment?

I have the same problem. You had any feedback yet?

Have you tried Open Xcode. Select the "Window" menu. Select "Devices and Simulators". Select Simulators tab. Click on the "+" icon at the left bottom. Choose the desired device & preferred iOS. Click "Create".

I am sorry about the confusion I have caused. The original problem was for an unsigned certificate for which the solution was to download and process the AppleWWDRCA.cer. The problem I put the comment in for was for a different problem. I have taken on your advise about cleaning up the warnings so will do that next and see if the latest problem persists and if it does add another entry for that with all the details I can sort out.

I thought it might be that I was using Xcode 10 on Catalina so upgraded to Big Sur and Xcode 12 and got the same error. Using the certification assistant I tried to validate the certificate and got a note that no root certificate was found. Screen shot taken but don't know how to add it here.

I have got a problem here. I have checked my details on developer.apple.com and confirm my id and team id but I do not have any profiles so where is xcode getting the provisioning profile ed56de56-24f3-4e05-b90f-8c0fdb454ce0 from?

This is a Unity project which delivers an iOS project for distribution. I have tried changing the build to automatic in xcode on my macbook but that does not work. I thank you for the help provided. I will raise a request in the Unity forum.

It was set to manual. I had tried automatic and got an error as in the screenshot here. I do not know how to solve this one either.