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Keil uvision 3 prob

Hi
I am new with Arm microcontrollers,i loaded Timer example, when i run th Simulator it stops when Timer0 Irq interrupt occurs.at instruction

LDR PC, IRQ_Addr

with error

*** error 65: access violation at 0x00000018 : no 'execute/read' permission

Plz tell me what can be the problem....

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