I have set up merge handler for custom facet seeing this documentation.
I put sc.CustomPlugins.xml file -> App_data\config\sitecore\Collection\ And dll file -> App_data\jobs\continuous\AutomationEngine.
But when I try to load my site, I am getting Sitecore.XConnect.XdbCollectionUnavailableException error. How to fix this issue ? Or why its happening?
Apart from that if I delete sc.CustomPlugins.xml, my site is working again.
Also after set up that merge handler I am getting this issue in xconnect site.