Unable to transfer XEM from Bittrex and Polo to my NanoWallet

OK. Maybe some of you already answered this question.

I saw a post here about the same problem but still can’t wrap my head around it even after reading what Phin2 and Saul (Tech Support) were discussing.

I installed the Nano Wallet yesterday on my laptop and did all the settings. This part of the operation is fine and running well.

Now, I want to transfer my XEM holdings from my Poloniex and Bittrex accounts. I used my “Receive Address” from the Nano Wallet, double checked if the address was identical and complete. Yes they were.

But both Poloniex and Bittrex show some kind of error : “Invalid Transaction” after I hit the Withdrawal button. I kept the “Message” box empty as I can’t figure out what this is. I wonder if this is what I am doing wrong.

Help would be highly appreciated. Thanks.