Meaning: During surface trim placement, the trimming surface must pass a set of validation checks to ensure the surface can be used to trim the member part. However, due to changes in the trimmed member and the trimming surface after the member is placed, the surface is no longer a valid surface for trimming the member part.
Recovery: Review the surface trim connection and replace it with a trim surface that is valid for the current configuration of the member parts. It is possible the trimmed part was moved incorrectly and needs to be repositioned so that the surface trim will succeed.