求助，用MIDAS做连续梁的施工阶段

如题，遇到了很多错误，应该怎么改啊？附上模型，大家帮我看看WARNING : NODE NO. 2 DY DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 8
WARNING : NODE NO. 2 RX DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 10
WARNING : NODE NO. 2 RZ DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 12
WARNING : NODE NO. 2 RX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 10
WARNING : NODE NO. 2 RZ DOF MAY BE SINGULAR.
MULTI-FRONTAL SOLUTION HAS BEEN PERFORMED 70 % .
WARNING : NODE NO. 26 DX DOF HAS A SINGULAR DIAGONAL = 0.000
WARNING : EQUATION NO. 133
WARNING : NODE NO. 26 RX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 136
WARNING : NODE NO. 26 RZ DOF MAY BE SINGULAR.等等