Thanks for the bug report. I can make a simple patch, will do this afternoon and also check for the same on CCEDK while I am there.
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The currency was renamed to US-NBT recently. Maybe that’s the problem.
You are right. I know about that change. The wrapper needs to be adjusted.
I just wanted to provide a helpful error report 
Changes required to adapt the pair to the new currencycode are non-trivial. I’ll need some extra time
I hope poloniex delay this change or else we will not have any walls there!
Why the other exchanges were so eager to make this change?