Is your account is currently unable to use the community market?
To begin with, look precisely what the error comment tells you. Maybe, there is additional information about the reason for this problem. If it doesn’t include any extra info, you need to dig deeper. Each situation is individual; sometimes the error may be connected to the products which are currently on sale. The best idea is to write to the Steam Support. While waiting for the response from Steam, look at the history of your purchases. Maybe, the problem is connected with the products on sale