Oracle Message PGA-20965 - syncpoint error: expecting string PS header, received string

ERRORsyncpoint error: expecting string PS header, received string
CAUSEDuring the processing of a 2-phase commit, an incorrect response was received from the remote transaction program following a syncpoint control command. The response received was and not a PS header as expected.
ACTIONThis is an error in the remote transaction program or the remote OLTP. Check the remote system for error messages from the OLTP. Contact the system administrator for the remote system to assist in problem determination.