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Dear Altair support team Let me explain regarding my FE model, I usually set up such kind of bumper model for crash analysis, unfortunately, this time I faced with the unfamiliar issues. As usual, I used the Tied_contact (Type2) to represent the spot welding by specifying the contact pairs as [M] cotact_surface and [S] GRNODE manually. You can see the spot weld locations as the figure below (green ball represent the spot weld). For the self-contact, I used the Type19 and defined the contact pairs as SURF_EXT_PART for both. Before running, I already used the Model checker but no error was found. I will briefly show those kinds of errors, ERROR ID : 558 ** ERROR IN INTERFACE DEFINITON (MASTER SURFACE) <<< This error came from Self-contact when I remove self-contact, this issue disappeared. ERROR ID : 611 ** ERROR IN INITIAL PENETRATION IN INTERFACE <<< This error came from Self-contact when I remove self-contact, this issue disappeared. I already fixed the initial penetration of model WARNING ID : 343 ** WARNING : INITIAL PENETRATIONS IN INTERFACE WARNING ID : 499 ** WARNING : INITIAL PENETRATIONS IN INTERFACE ERROR ID : 22 ** ERROR IN SHELL DEFINITION DESCRIPTION : SHELL ID=222890 HAS 2 IDENTICAL NODES THAT ARE NOT 3 & 4 ERROR ID : 35 ** ERROR IN TRIANGULAR SHELL GEOMETRY For those issues, I tried to fix it first but it doesn't work, I can share you this model for further details and the error format is attached to this post Best regard Nut Error_Format.txt