8051 microcontroller keil assembly language program simulation problem

Hi,
I have written a program on 7 segment display interfacing. It will count from 0-9. These is a warning every time, I can't get where is the error. Moreover, I am burning the program into my AT89C51 IC, but it is not working as per program.
1. First, please have a look at my code and errors.

ORG 00H
S1: MOV P2,#0C0H
LCALL DLY
MOV P2,#0F9H
LCALL DLY
MOV P2,#0A4H
LCALL DLY
MOV P2,#0B0H
LCALL DLY
MOV P2,#99H
LCALL DLY
MOV P2,#92H
LCALL DLY
MOV P2,#82H
LCALL DLY
MOV P2,#0F8H
LCALL DLY
MOV P2,#80H
LCALL DLY
MOV P2,#90H
LCALL DLY
MOV P2,#7FH
LCALL DLY
LJMP S1
DLY: MOV R1,#20H
HERE: DJNZ R1,HERE
RET
END

And, the error is:
***WARNING L5: CODE SPACE MEMORY OVERLAP
FROM: 0000H
TO: 0002H
*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
SYMBOL: MAIN
MODULE: seven.obj (SEVEN)
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?MAIN?SEVEN
Program Size: data=30.1 xdata=0 code=1201
Target not created

Please tell me where am I wrong? I am beginner, so please guide me. Thanks :?::?:

dear you must start with
ORG 0000H
LCALL MAIN
ORG 0080H
MAIN
past rest of code here.

dear your problem solved or not, you have not mentioned this here.
just clicked helped, no comments.

This code helped me, shahbez. Thanks