我的MIDAS模型在运行过程中，程序提示说出错，强制退出，不知是何原因？请高手指教。摘录的部分运行日志如下：
ENTRY STATIC ANALYSIS FOR NONLINEAR. ITERATION NO. : 1
WARNING : NODE NO. 462 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1897
WARNING : NODE NO. 464 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1903
WARNING : NODE NO. 465 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1904
WARNING : NODE NO. 465 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1905
......
WARNING : NODE NO. 342 DZ DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 1267
WARNING : NODE NO. 342 DX DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 1265
WARNING : NODE NO. 342 DY DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 1266
WARNING : NODE NO. 342 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1265