2183634 - CTS+: Error CANNOT_GET_DEFAULT_REQUEST

During a CTS+ export in the Enterprise Services Builder there is the following error:

The error message in screenshot above is a generic message, verify defaultTrace_XX.X.trc file (/usr/sap/<SID>/<JXX>/j2ee/cluster/server<X>/log is directory in which defaultTrace is located) for more details.

Following are some usual errors/exceptions reported in defaultTrace:

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Cannot get default request (for application type: XI, user: <UserID>, SID: <SID>, SC: <ID>): Check stack trace for details [CANNOT_GET_DEFAULT_REQUEST]
[...]
Error executing function (check stacktrace for details): CTS_WBO_GET_DEFAULT_REQUEST [EXECUTION_ERROR_CHECK_STACKTRACE]
[...]
[EXCEPTION]
com.sap.conn.jco.JCoException: (126) INVALID_SYSTEM: System <SID> is not valid; configure Organizer client in TMS.
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Cannot get default request (for application type: XI, user: <UserID>, SID: <SID>, SC: <ID>): Check stack trace for details [CANNOT_GET_DEFAULT_REQUEST]
[...]
Error executing function (check stacktrace for details): CTS_WBO_GET_DEFAULT_REQUEST [EXECUTION_ERROR_CHECK_STACKTRACE]
[...]
[EXCEPTION]
com.sap.conn.jco.JCoException: (126) INVALID_SYSTEM: System <SID> is unknown.
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• SAP Netweaver release independent.

PI, XI, Unable to connect to CTS System, transport, configuration, plus, Enhancement, non-ABAP, com.sap.conn.jco.JCoException (126), INVALID_USER, EXISTENCE, does not exist in the system. , KBA , BC-CTS-ORG-PLS , Transport Organizer for non-ABAP (CTS+) , Problem