RUNNING HERCULES DRC

Hi everybody ,

I am runnning Hercules to check DRC of my layout . I am using National
Semiconductors 0.18um technology (cmos9) . From terminal I am
running the command
hercules HERCULES/DRC/current/cmos9_drc_m45_v124.ev

in cmos9_drc_m45_v124.ev file the environmental set up are given
below

/* ENVIRONMENT VARIABLES */

ENVIRONMENT STRING LAYOUT_PATH DEFAULTS TO "./"
ENVIRONMENT STRING INLIB DEFAULTS TO "GDS2FileName";
ENVIRONMENT STRING BLOCK DEFAULTS TO "topBlockName";
ENVIRONMENT STRING METAL_LAYERS DEFAULTS TO "5LM"; /* 4LM 5LM */
ENVIRONMENT STRING CHECK_GENLAYER DEFAULTS TO "TRUE"; /* FALSE TRUE
*/
ENVIRONMENT STRING OPEN_NETS DEFAULTS TO "___";
ENVIRONMENT STRING POWER_NETS DEFAULTS TO "*VDD* *vdd* *vcc* *VCC*
*VSB* *vsb* VPP *VBAT* *pwpr* *PWPR* *pwrp* *PWRP*";
ENVIRONMENT STRING GROUND_NETS DEFAULTS TO "*VSS* *vss* *GND* *gnd*
*Gnd* *PWRN* *pwrn* VBULK vbulk ESD_M";
ENVIRONMENT STRING REMOVE_TEXT_FROM_SHORT DEFAULTS TO "FALSE"; /*
FALSE TRUE */
ENVIRONMENT STRING CIRCUITRY DEFAULTS TO "EPI"; /* EPI NON-EPI */
ENVIRONMENT STRING DATABASE DEFAULTS TO "GDSII"; /* GDSII MILKYWAY
*/
ENVIRONMENT STRING TITLE_LAYERS DEFAULTS TO "FALSE"; /* FALSE TRUE */
ENVIRONMENT STRING CONNECT_BY_NAME DEFAULTS TO "CONNECTED"; /*
CONNECTED ALL */
ENVIRONMENT STRING RECOGNIZE_METAL_RESISTORS DEFAULTS TO "TRUE"; /
* FALSE TRUE */
ENVIRONMENT STRING BUMP_METAL DEFAULTS TO "FALSE"; /* FALSE TRUE */
ENVIRONMENT STRING TUBNOT_EXISTENCE DEFAULTS TO "FALSE"; /* FALSE
TRUE */
ENVIRONMENT STRING DELETE DEFAULTS TO "";



the error I am getting is

Parsing runset "HERCULES/DRC/current/cmos9_drc_m45_v124.ev"

ERROR: The GDSIN will erase layout in the "group" directory. Please
change the GDSIN_DIR to a different name or remove the layout in the
"group" directory.
Hercules Run: Time= 0:00:00 User=0.10 System=0.00
Hercules is done.


Please help to fix my problem.

Thanking you all in advance .


cheers
Sabyasachi