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

wings chen

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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