I can't trade with my friends

my trade line is inactive among my friends, nore i can't receive their trades!
have tried refresh the page, have tried log out and emptying my cache, have tried deleting my friend and add them again, nothing worked.
among my guild members i can use trade line but with friends that aren't in my guild i can't
looks like they can't either!
i want to know if that's a bug, a server problem...what it is??
i want to trade with my friends even if they aren't members of the same guild with me!
please look at this problem and fix it!

Hi rogvaiv,

Please contact Support right here and explain your issue.

Thank you.

BB_Dantesama