excuse，can you tell me how to handle the promble when i create an iteraction between two solid parts, and it cause the problem of hard to convergence.
the warning is:
***WARNING: A SLAVE SURFACE DEFINITION HAS BEEN DEFINED ON A FACE OF ELEMENT 1 THAT CONTAINS NO MIDFACE NODE. THIS MAY LEAD TO CONVERGENCE DIFFICULTIES. THE ELEMENT TYPE WILL BE CONVERTED AND A MIDFACE NODE GENERATED ATICALLY. THE ELEMENT NUMBER WILL BE UNCHANGED. SEE THE OUTPUT FROM THE PREPROCESSOR TO CONFIRM THE NEW ELEMENT AND NODE DEFINITIONS. THIS MESSAGE WILL NOT BE REPEATED IF SUBSEQUENT ELEMENTS OF THIS SURFACE ARE CONVERTED