ARM Parallel Port Programmer Problem not detecting the target??

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Helllo!!! Everyone i am using this Parallel Port Programmer
http://shop.ngxtechnologies.com/prod...products_id=29

to program my LPC2148, it is a Wiggler Based Programmer and is supported by H-JTAG Software.

I tried to use this programmer with Keil Directly, but failed because i had not started H-JTAG Server, after that i started H-JTAG Server and my Controller gets detected as ARM7TDMI-S microcontroller in H-JTAG Server, after that i open H-Flasher and then program a simple code to blink LED's.
Its programs and verify properly but LED's on board doesn't work but when i reset the board by reinserting its power it works.
But after that H-JTAG Server is not able to detect the target, i dont know why??
Its works for the first time and till now it is not detecting target and giving this error.



Even if i didn't connect the hardware its giving the same error.
Please suggest me what might be the problem.