-137 ERR REQ REJECTED (Magic xpa 3.x)
This error occurs in the following scenarios:
The enterprise server cannot execute the request because of a timing problem. This error is usually related to switching between Development mode and Project Execution mode.
A RIA request does not have the MgxpaRIAglobalUniqueSessionID header.
In the Single User Edition, upon receiving a request from a Browser Client.
In the Single User Edition or the Express version, upon receiving a request from a Web service client.