When upgrading CUC 9.1.1 to 9.1.2. You may receive the following error when switching between active and inactive partitions.

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Operation failed

ERROR: Sync after switch version failed
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Steps to resolve the issue

On Subscriber run – utils dbreplication stop (here you have to wait some time once is finish wait for like 10 min.)

On Publisher run – utils dbreplication stop (here you have to wait some time once is finish wait for like 10 min.)

On Publisher run – utils dbreplication reset all

Reboot both servers using: utils system restart

On the Subscriber utils cuc cluster overwritedb (here you also need to give it time)