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Error access violation

I am using AT91SAM7X-EK to do a very simple experiment which is show "hello" in UART1 by simulator.

The code can be successfully compiled with no error. but while I used debug, it showed following error,

"error 65: access violation at 0x00000000: no 'execute/read' permission"

From www.keil.com/.../at91sam7x128_256_pc.pdf, p16 Fig 9-1, the start address of internal flash should be 0x00100000. I don't understand why error seems want to start at 0x0. and how to fix this problem.

Thanks...

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