Warning in volume definition

Dear ALL,

WARNING ID :          329
** WARNING IN VOLUME DEFINITION
DESCRIPTION :  
   -- MONITORED VOLUME ID : 8
   -- MONITORED VOLUME : rl2
   NEGATIVE VOLUME DUE TO A WRONG ELEMENT ORIENTATION
     INITIAL SURFACE OF MONITORED VOLUME . .=  0.000000000000    
     SURFACE ERROR(NE.0 FOR NON CLOSED SURF)=  0.000000000000    
     INITIAL VOLUME OF MONITORED VOLUME. . .=  0.000000000000    
     GAMMA . . . . . . . . . . . . . . . . .=  1.400000000000    
     VOLUMIC VISCOSITY . . . . . . . . . . .= 1.0000000000000E-02
     EXTERNAL PRESSURE . . . . . . . . . . .= 1.0000000000000E-02
     INITIAL PRESSURE. . . . . . . . . . . .= 0.5000000000000    
     BURSTING PRESSURE . . . . . . . . . . .= 1.0000000000000E+30
     INCOMPRESSIBLE VOLUME.. . . . . . . . .=  0.000000000000    
     INITIAL MASS. . . . . . . . . . . . . .=  0.000000000000    
     VENT HOLES                              
     ----------                              
     NUMBER OF VENT HOLES. . . . . . . . . .=         0

     VOLUME NUMBER          9

     TYPE OF MONITORED VOLUME. . . . . . . .=         3
     EXTERNAL SURFACE ID . . . . . . . . . .=    149119
     UNIT SCALE FOR TIME FUNCTIONS          =  1.000000000000    
     UNIT SCALE FOR PRESSURE FUNCTIONS      =  1.000000000000    
     UNIT SCALE FOR AREA FUNCTIONS          =  1.000000000000    
     UNIT SCALE FOR ANGLE FUNCTIONS         =  1.000000000000    
     UNIT SCALE FOR DISTANCE FUNCTIONS      =  1.000000000000    

Kindly give your suggestions

Thanks

RAM