Lpc2000

Hi everyone,
   
  I obtain the following message when i try to download the code with J-Link;
   
  "Could not identify firmware(identification string has length of 0)"
   
  or 
   
  "Received 0xFFFFFFFF as core Id.
  No communication with core"
   
  I checked all J-Link connections and LPC pins.
   
  I use;
  MCU :  LPC2131
  Comp:  IAR 4.30A
   
  I hope someone can help me.
  Have a nice day,
   

		
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