Strange message on the trade

Hello! While I am on a trade with some players and just having the trade window open I am receiving the following message at the left part of the screen: :"You can't get the item" I have fo set so it can't be traded (I wasn't on LD) so this made think that the other player maybe try to get my items, I don't know if this is just a bug but I would like to learn why it happens... P.S: This is a ps I got during a trade


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did u tried to take the angel? maybe thats why...because those items can not be traded

 

that usually appear when u r joining a party and items are arround, between u and the PL

 

also appears when you try to pick up an item when you are in a trade

 

Especially when I got the ss, I just having the trade window open, nothing else! No problem as I saw it isn't nothing to worry about so...

 

u might have pressed "Space" by mistake