Too many devices connected in a chain

hello friends
I am working on olimex strE912 evaluation board.While i started working on it,it was being programmed properly.But now it is not being programmed due to an error saying "Too many devices in a chain",while only one device is being programmed using JTAG.Can anybody suggest me the reson why is it happening?and what can be done to remove this error?

with regards
puneet mishra

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