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Dear VASP users

I have encounter trouble in vasp calculation
What means the following error message?


VERY BAD NEWS! internal error in subroutine LUDCMP:
SINGULAR MATRIX -3
FORTRAN STOP


VERY BAD NEWS! internal error in subroutine LUDCMP:
SINGULAR MATRIX -3
FORTRAN STOP
FORTRAN STOP
-0.219523789706E+04 -0.71245E-02 -0.38528E-02 79824 0.138E-01 0.331E+00
RMM: 42 -0.219524886112E+04 -0.10964E-01 -0.48750E-02 81517 0.146E-01 0.173E+00
RMM: 43 -0.219527612446E+04 -0.27263E-01 -0.69286E-02 78135 0.192E-01 0.125E+00
RMM: 44 -0.219530597416E+04 -0.29850E-01 -0.15297E-01 79602 0.267E-01 0.277E+00
RMM: 45 -0.219530650959E+04 -0.53544E-03 -0.64143E-02 83945 0.150E-01

VERY BAD NEWS! internal error in subroutine LUDCMP:
SINGULAR MATRIX -3

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