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how to solve " error 65: access violation at C:0x0042 : no 'execute/read' permission"?

The following is my program: ORG 0000H LJMP MAIN ORG 0030H
MAIN:MOV A,@R0 MOV B,#100 DIV AB INC R0 MOV @R0,A MOV A,#10 XCH A,B DIV AB INC R0 MOV @R0,A INC R0 MOV @R0,B END

When I debugging it,the " error 65: access violation at C:0x0042 : no 'execute/read' permission" occured.

I am a new guy for KEIL.
How should I do?
Please & Thanks!

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