Replication failure Invalid Hex String:12

We have Symantec 12.1.6 installed in our environment . Replication is scheduled betweem SEPM manager servers. Replication

fails for one of the server . Below is the log available.

June 9, 2016 5:25:17 PM IST:  Replication from remote site %%%%% to local site &&&&& finished unsuccessfully ]
June 9, 2016 5:25:16 PM IST:  Unexpected server error. 
June 9, 2016 5:25:16 PM IST:  Unable to fetch changed data from remote site [&&&]: Invalid Hex String:12   
June 9, 2016 5:25:14 PM IST:  Unexpected server error. 

Please share if any trobleshooting steps are available