Avamar Administrator GUI: "Unable to retrieve virtual machine backup configuration.error unmarshalling return"


   Article Number:     502475                                   Article Version: 2     Article Type:    Break Fix 









The customer is attempting a VM restore but getting a java pop-up error containing:   
    "Unable to retrieve virtual machine backup configuration.  error unmarshalling return; nested exception is: java.io.InvalidClassException: com.avamar.mc.vmware.VmDisk; local class incomplatible: stream classdesc serialVersionUID"   
                                          Avamar MCGUI Java Exception






The Avamar Administrator client software and the Avamar Management Console Server ( MCS ) software are not running the exact same versions     
      This can be checked from within the Avamar Administrator by selecting Help -> About.  For example:
    User-added image






The Avamar server may have been upgraded but the client software was not updated to reflect the new server version.                                                           






Update the Avamar Administrator GUI version to match that of the server.  To do this, follow the "Installing Avamar Administrator"  section from the "EMC Avamar 7.x Administration Guide" for the relevant supported Windows or Linux client computer platform.