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Access violation

I'm relatively new to Keil and C167. I got an error: "error 65: access violation" while debugging an assembly program using simulator. I tried these 2 sets of assembly code

1) Using EXTS

EXTS #4, #3
mov r1, #0x0A
mov r2, #0x1000
mov [r2], r1

2) Using DPP

mov DPP2, #0x0010
mov r1, #0x0A
mov DPP2:0x1000, r1

But both gives me the error: "error 65: access violation: addr=0x00041000".

In the project settings, I had mentioned 40000 to 90000 as External RAM.

Would be grateful if you can correct me and provide me some guidance.

Thanx in advance...!!!