Assembly programming Error: L6218E

Hi there,
Iam trying out the following asm program(test.s) in KeiluVision3 (v3.24). Iam getting the following error
Test_Keilasm.axf: Error: L6218E: Undefined symbol __main (referred from lpc2300.o) after assembling it.
Kindly give your valuable suggestions to debug this error.

        AREA test,CODE,READONLY
ENTRY

        MOV r0,#3
        MOV r1,#5
        CMP r0,r1


        END



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