Unable to find unity activity in manifest. You need to make sure orientation attribute is set to fullSensor manually. UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

Can anybody give me an idea of what this warning means or what it relates to?

My augmented reality program was running on my tablet using Unity Remote 4 fine, but I seem to have come back to it and it runs but the AR target card doesn't produce the model any more and this warning is all I have to go on at the moment.

Had such trouble getting it running on my tablet and now its gone wrong in a different way :(

Thanks.