QOCA: cov_eigen error.

[tianyf@tyf tmp]$ cov_eigen mrgqob/snxes.qob coveigen.out 1
    Begin to check <<< qobs/sioigs13650.qob
  trouble in dpttrf of dpteqr: 456 456  0.
 problem in dpteqr
  the  456-th term is not positive defined
    Begin to check <<< qobs/sioigs13651.qob
  trouble in dpttrf of dpteqr: 474 474  0.
 problem in dpteqr
  the  474-th term is not positive defined
    Begin to check <<< qobs/sioigs13652.qob
  trouble in dpttrf of dpteqr: 480 480  0.
 problem in dpteqr
  the  480-th term is not positive defined
    Begin to check <<< qobs/sioigs13653.qob
  trouble in dpttrf of dpteqr: 483 483  0.
 problem in dpteqr
  the  483-th term is not positive defined
    Begin to check <<< qobs/sioigs13654.qob
  trouble in dpttrf of dpteqr: 465 465  0.
 problem in dpteqr
  the  465-th term is not positive defined
    Begin to check <<< qobs/sioigs13655.qob
  trouble in dpttrf of dpteqr: 462 462  0.
 problem in dpteqr
  the  462-th term is not positive defined
    Begin to check <<< qobs/sioigs13656.qob
  trouble in dpttrf of dpteqr: 477 477  0.
 problem in dpteqr
  the  477-th term is not positive defined

The output file:

              INF  4.254973E+02  0.000000E+00  453  456  456   qobs/sioigs13650.qob
   adding term:  0.1000E-05
     4.694180E+08  4.694180E+02  1.000000E-06    1  456  456   qobs/sioigs13650.qob
              INF  4.146400E+02  0.000000E+00  471  474  474   qobs/sioigs13651.qob
   adding term:  0.1000E-05
     4.531920E+08  4.531920E+02  1.000000E-06    1  474  474   qobs/sioigs13651.qob
              INF  4.084898E+02  0.000000E+00  477  480  480   qobs/sioigs13652.qob
   adding term:  0.1000E-05
     4.496876E+08  4.496876E+02  1.000000E-06    1  480  480   qobs/sioigs13652.qob
              INF  4.067726E+02  0.000000E+00  480  483  483   qobs/sioigs13653.qob
   adding term:  0.1000E-05
     4.452042E+08  4.452042E+02  1.000000E-06    1  483  483   qobs/sioigs13653.qob
              INF  4.198978E+02  0.000000E+00  462  465  465   qobs/sioigs13654.qob
   adding term:  0.1000E-05
     4.699089E+08  4.699089E+02  1.000000E-06    1  465  465   qobs/sioigs13654.qob
              INF  4.236193E+02  0.000000E+00  459  462  462   qobs/sioigs13655.qob
   adding term:  0.1000E-05
     4.703942E+08  4.703942E+02  1.000000E-06    1  462  462   qobs/sioigs13655.qob
              INF  4.191456E+02  0.000000E+00  474  477  477   qobs/sioigs13656.qob
   adding term:  0.1000E-05
     4.567178E+08  4.567178E+02  1.000000E-06    1  477  477   qobs/sioigs13656.qob