selling Cadastral to buy BTS Conversion is need to pay the fee??

[ado1907]

Hi guys.

Im totaly new since 3-4 days... However i managed to open an account on  wallet.bitshare.org. I transferred some bitcon from CEXIO platform to my bitshare account.  Here i bought with my BTS --> Cadastral.  know when I want to sell Cadastral to buy BTS I get indications that there isn't enough fee that I must converse some Cadastral to BTS so the fee can get payed....

I hope you understand what the problem is.  I need some help!

Thank you in advance.