See Also
Steam Support :: Limited User AccountsSteam Support :: Retrying a failed purchase - saved shopping cartFrequently asked questions | SkinwalletSteam Support :: Steam Trade and Market HoldsSteamErrors.com
Valve's Comments
Too much of a good thing
Trade Offers
You may receive this result when sending, accepting, declining, or canceling a trade offer. Below is an explanation of what this result means in this context.
Sending this trade offer would put you over your limit. You are limited to 5 Active offers (including those requiring confirmation, but excluding those in escrow) to a single recipient, or 30 Active offers total. If you are accepting a trade offer, then your inventory for a particular game may be full.
