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Nastran:LOWER TRIANGULAR FACTOR HAS DIAGONAL TERM = 0

Nastran:LOWER TRIANGULAR FACTOR HAS DIAGONAL TERM = 0

Nastran:LOWER TRIANGULAR FACTOR HAS DIAGONAL TERM = 0

(OP)
Hello Guys!

I got the following warning Msg. Does any body have an idea what does it exactly mean and how to fix it.
I know Mode shapes should be Independent. But I don't know how to fix them If the are dependent.

Waiting for your tips!
Thanks a lot!

 ^^^ USER INFORMATION MESSAGE 9037 (RESVEC  )    
 ^^^ CHECKING RESIDUAL VECTORS FOR LINEAR INDEPENDENCE.  
 *** SYSTEM WARNING MESSAGE 6731 (SDCBOD)
    ROW     3 OF LOWER TRIANGULAR FACTOR HAS DIAGONAL TERM = 0( OR .LT. 0 IF CHOLESKY )

 *** SYSTEM INFORMATION MESSAGE 4214 (SDCBOD)
      1.0E-10 SUBSTITUTED FOR DIAG. TERM OF LOWER TRIANGULAR FACTOR AT ROW      3
 *** SYSTEM WARNING MESSAGE 6731 (SDCBOD)
    ROW     4 OF LOWER TRIANGULAR FACTOR HAS DIAGONAL TERM = 0( OR .LT. 0 IF CHOLESKY )
 *** SYSTEM INFORMATION MESSAGE 4214 (SDCBOD)
      1.0E-10 SUBSTITUTED FOR DIAG. TERM OF LOWER TRIANGULAR FACTOR AT ROW      4
 *** USER INFORMATION MESSAGE 4158 (SDCBOD)
     STATISTICS FOR SYMMETRIC DECOMPOSITION OF DATA BLOCK MZZ      FOLLOW
           MAXIMUM RATIO OF MATRIX DIAGONAL TO FACTOR DIAGONAL = 1.0E+10 AT ROW NUMBER      3

 ^^^ THE FOLLOWING MODE SHAPES (EIGENVECTORS OR RESIDUAL VECTORS) ARE NOT LINEARLY INDEPENDENT WITH OTHER MODE                     
     SHAPES AND WILL BE DISCARDED.   
 ^^^ MZZ MATRIX DIAGONALS/FACTOR DIAGONALS,RESVRAT=   1.000000E+08
0                BIGRATS                                                                                                            
     POINT           VALUE     POINT           VALUE     POINT           VALUE     POINT           VALUE     POINT           VALUE  
 COLUMN           1
          3  H  1.00000E+10         4  H  1.00000E+10

 *** USER INFORMATION MESSAGE 5458 (REIG)
     QL HOUSEHOLDER METHOD IS AUTOMATICALLY SELECTED .
 ^^^ FREQUENCY LIST OF SCALED COMPONENT MODES FOLLOWS.    

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