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SWD/Jtag communication failure

Ham Lot

Hi,
i Design a board with LPC4357, and i Program it.
after about 30times programing i have a error in programing!!!
Keil unknown my programmer!!
i use ulink2 and keil Version4.72
now when i want program my board ,i get this error:
in jtag mode: Jtag communication failure
in SW mode: SWD communication failure

any body can offer me?

thank you in advance

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