Cisco ACS register to primary with different acs versions

[lmediavilla]

Hello, I've updated a backup unit of two acs to  version 5.4.0.46.0a first I changed it to standalone, and now I try to register to the main ACS which is running version 5.1.0.44.2

  And I get this error

This System Failure occurred:  com.cisco.nm.acs.im.certificate.Certificate; local class incompatible: stream classdesc serialVersionUID = 8507982043664257993, local class serialVersionUID = 1927357986028617243. Your changes have not been saved.Click OK to return to the list page.

What can I do to solve it?

Kind regards

[Jatin Katyal · Accepted solution]

The primary and secondary should be running on the same code.

Jatin Katyal
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