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Keil cannot download a program to SAM3U4E

Hi everybody.
I designed and made a custom board with AT91SAM3U4E.
Then I wrote a simple Blinky program and compiled it with Keil.
When I want to download it to microcontroller with ULINK2 I get this error message:
"Flash Download failed - "Cortex-M3""

In the output window Keil prompts me "Cannot access memory".

Does anybody know how I can solve this strange problem?
Thanks in advance.

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