It sometimes may happen due to a Network issue. But if the problem persists and happens frequently, you can contact Developer Support by opening a support case.

Thanks I have raised a support case - its unlikely to be a network issue between my software and RC - the body of the error said there was Internal Server Error

Content: {

"errorCode" : "AGW-105",

"message" : "Internal Server Error. Consult RC Support.",

"errors" : [ ]

}