natran模态计算，.f06文件提示错误（SWM 7340 ）
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NASTRAN计算白车身模态，.f06文件中有9个error，其中有部分信息如下：
***SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNP1ED (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
。
。
。
***SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNP2CD (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
*** SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNDRVD (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
TABLE OF SHIFTS: (LNNRIGL)
SHIFT # SHIFT VALUE FREQUENCY, CYCLES # EIGENVALUES BELOW # NEW EIGENVALUES FOUND
1. 9.3913338E+01 1.5423529E+00 FACTOR ERROR 0
2. -1.2758284E+04 -1.7976961E+01 FACTOR ERROR 0
3. -3.2628135E+04 -2.8748569E+01 FACTOR ERROR 0
排除了很久也没弄清问题出在哪里，不知道怎么修改了，求大神指导！
***SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNP1ED (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
。
。
。
***SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNP2CD (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
*** SYSTEM WARNING MESSAGE 7340 (LNNHERR)
PROCESS ERROR REPORTED BY SUBROUTINE LNNDRVD (IER= -729)
USER INFORMATION: REPEATED SINGULAR MATRIX -- PROBABLY ILL-POSED PROBLEM.
TABLE OF SHIFTS: (LNNRIGL)
SHIFT # SHIFT VALUE FREQUENCY, CYCLES # EIGENVALUES BELOW # NEW EIGENVALUES FOUND
1. 9.3913338E+01 1.5423529E+00 FACTOR ERROR 0
2. -1.2758284E+04 -1.7976961E+01 FACTOR ERROR 0
3. -3.2628135E+04 -2.8748569E+01 FACTOR ERROR 0
排除了很久也没弄清问题出在哪里，不知道怎么修改了，求大神指导！
NO FATAL