This error indicates that the model did not solve and you might be seeing an unconverged result. The reason for error looks to be an unconstrained model. Try changing the frictionless support to a bonded one and then have a look a the results. The results with a yellow bolt mark are an indication for the same. On why you are not able to save the model, I am not sure, it should save.
Also, please see if the following discussion is of some help to you:
Please Login to Report Topic
Please Login to Share Feed
New Post - Reply To: Result Evaluation after error
You are navigating away from the AIS Discovery experience