I was in a situation where I didn't use Endpoint Server or Capsule workspace, but couldn't migrate export because I had plugins that showed to be installed when I ran fwm ver:
Endpoint Security Management R77 Plug-in
Capsule Docs DLP Add-on
I ran rpm -qa and found:
CPPIuepmars-R77-00
CPPIcapsule-R77-00
CPuepm-R77-00
Uninstalled them with rpm -e <name of rpm>. First when I tried to uninstall, I was prompted to run "/opt/CPPIcapsule-R77/bin/uacRunner -p PIcapsule -preuninstall" for example, but once I ran that and it confirmed there were no dependencies, it told me to run the above rpm -e command again, and then it took. Then I migrate exported afterwards, but before I could successfully migrate import into the new target mgmt server, I had to remove CPuepm-R77-00 from it as well.
I don't know what the name of the R77.30.03 plugin is, but it may be the same idea. Since I didn't want to call TAC as was recommended here for my similar issue, and was able to get it working by removing the above plugins, I thought it might be helpful for others coming across this thread if I posted this. Or maybe it's just more confusing and you should call TAC.