Withdrawal failure from Bittrex [MOVED]

Hi, any suggestions appreciated:
I have a mobile NEM wallet, and am getting an error when attempting to withdraw XEM from Bittrex, I get this:
The address you submitted is not valid for the XEM network. Cancel this withdrawal and resubmit it.
The address is definitely correct, it is my public key from the wallet, copied and pasted, no white space

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