In my Dev lab we upgraded FIM 2010 to MIM 2016 prior to attempting in production.  We stood up a new SQL 2012 box and a Server 2012 box.  The front end server has the Synchronization Service and Portal services for Password Registration and Reset.

Upgrade went fine with no errors encountered during the upgrade sequence.

The portal works great and all Resets and Registration works fine after the migration.

My issue is when I launch Synchronization service and attempt to run my FIM Management Agent with any of the Configured Profiles Sync,Import, Export.  I get a pop up that says unexpected error occurred and I get no further information on the actual Syncrhonization Service GUI.

Attached is a screen shot of the pop up.  I refreshed the Schema and it didn't change the situation.  My ADMA works fine without a problem.

Event logs shows the following error:

"the Server encountered an unexepected error while performing an operation for management agent.

"BAIL: MMS(9668): ..\ma.cpp(3781): 0x80070002 (The system cannot find the file specified.)

Forefront Identity Manager 4.3.1.1935.0"

I have run a repair on the Service and Portal and came up empty handed.  I also created a 2nd FIM MA just to see if it would go further but it popped the same error.  Any ideas or suggestions?

1. We cannot see any screen shot, so we don't know where the error occurs.

2. Make sure the version of Sync and Portal are the same.

Here are two issues I resolved after our upgrade from FIM 2010 to MIM 2016. Perhaps your issue is similar/related:

http://setspn.blogspot.be/2015/09/mim-2016-failed-to-connect-to-specified.html

http://setspn.blogspot.be/2015/09/mim-2016-no-start-ma-when-exporting-to.html