MIDAS错误提示，帮忙看看是哪些问题哦？谢谢

-----------------------------------------S T A R T I N G S O L U T I O N
MULTI-FRONTAL SOLVER
AVAILABLE MEMORY = 358.0 MBYTES
ENTRY PHASE FOR RENUMBERING
ENTRY NUMBERING_EQN
ENTRY FORM_STIFF_MASS_LOAD
THE INDIVIDUAL ELEMENT STIFFNESS AND LOAD MATRICES WILL NOW BE FORMED.
ELEMENT NO. : 776 OF 776
ENTRY SOLUTION PHASE
ENTRY LOAD_BLOCK
TOTAL NUMBER OF VALID DOFS IN MODEL : 2648
ENTRY ASSM_STIFF_LOAD ( FORM GLOBAL EQUILIBRIUM EQUATIONS IN BLOCKS )
MFSFactorizerLLT : DPOPTRF: Unable to continue factorization!
MULTI-FRONTAL SOLUTION HAS BEEN PERFORMED 10 % .
WARNING : NODE NO. 260 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1525
WARNING : NODE NO. 260 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1523
WARNING : NODE NO. 260 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1522
WARNING : NODE NO. 203 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1179
WARNING : NODE NO. 202 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1177
WARNING : NODE NO. 202 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1175
WARNING : NODE NO. 202 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1174
WARNING : NODE NO. 159 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 915
WARNING : NODE NO. 159 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 917
WARNING : NODE NO. 204 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1189
WARNING : NODE NO. 204 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1187
WARNING : NODE NO. 204 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1186
WARNING : NODE NO. 157 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 903
INCOMPLETE MULTI-FRONTAL SOLVER
IERROR= -5
这是什么问题啊？求帮助