What does the error message “Trade context is busy” mean?

The message “Trade context is busy” appears in the case of an unsuccessful attempt to pass an order. For example, it can happen when a client is sending too many requests for opening, modifying or closing an order, thus placing too much load on a server. Or it can appear when a client sends the second trade request without waiting for the result of the previous request (which may arise as a result of a temporary loss of communication with the trading server).