Abaqus求助

本人做轮轴配合，出现如下问题，希望得到大师的指点
（1）THE SLAVE SURFACES ASSEMBLY_SURF-LUN-1 AND ASSEMBLY_SURF-LUN-2 PAIRED WITH MASTER SURFACE ASSEMBLY_SURF-ZHOU INTERSECT EACH OTHER. IF BOTH PAIRS ARE *CONTACT PAIRs, THESE TWO PAIRS SHOULD NOT BE SIMULTANEOUSLY PRESENT IN A STEP BECAUSE OF POSSIBLE CONVERGENCE PROBLEMS; USE *MODEL CHANGE,TYPE=CONTACT PAIR TO REMOVE ONE OF THEM. IF BOTH ARE *TIE PAIRS, THE REDUNDANT TIES WILL BE REMOVED AUTOMATICALLY. IF ONE PAIR IS *TIE AND ANOTHER IS *CONTACT PAIR, REMOVE ONE OF THEM.
（2）There is zero FORCE everywhere in the model based on the default criterion. please check the value of the average FORCE during the current iteration to verify that the FORCE is small enough to be treated as zero. if not, please use the solution controls to reset the criterion for zero FORCE.Solver problem.
（3）Zero pivot when processing D.O.F. 1 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_1_2_1_1_1.
希望大师能给我点指点！谢谢！