Trade Market Troubles

Hello, I need help regarding the trade market. Anytime I try to buy or sell an item in the market it tells me,

"You don't have enough slots for this trade. Cancel an existing trade before creating a new one."

I've never traded anything on the market before, and the items I'm trying to purchase are withing my price and level range. Could anyone help explain why this may be?

 

your trade market slots are accessed by clicking the paper in the bottom right of the market menu. you might've left some items you were buying/selling in your slots

if they're actually empty and you still can't buy anything, file a bug report

 

You have a limited amount of trade slots, every time you try to buy/sell something one slot fills.
To clear the slot you have to cancel/claim the item
the trade slots can be accessed from the View Trades option

 

Thank you for the help.

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Thank you for the help.