The decoded text message was too big for the output buffer and the endpoint does not support partial messages

Hello, Now I met a problem, I use websocketpp in my project, and send message to other endpoint throught websocketpp. But the websocketpp connect is close because "The decoded text message was too big for the output buffer and the endpoint does not support partial messages". And I send out message is a sdp. So why this error is appear, and last one month this way is right.