Lpc2000

I have tried to program a fresh/new LPC2138 using Wiggler and Cross 
Studio 1.4. After creating a new project and copying a sample program 
I have built the code. But unable to initialize JTAG port (The message 
is "Cannot identify target.  Check JTAG connections and that the 
target is powered". The chip was powered and JTAG connection was 
correct. What may be the possible reason for this??

Sudip