I'm upgrading from Sitecore 8.1 rev3 to Sitecore 9.1.

The error is pretty straightforward, however I have already made sure that the 9.1 version of Sitecore.Analytics.dll - the DLL that contains Sitecore.Analytics.Pipelines.Initialize.ShowXdbInfo - is both correctly referenced by my project and present in the /bin folder.

My hypothesis is that something in my 8.1 config is breaking the system and triggering a deceptive and misleading error message, but I'm not sure what I could do to narrow it down - perhaps replace my entire configuration with the 9.1 default and gradually replace it with mine until I find the culprit?

I hope it won't have to come down to this.


Given the context, why I am still getting this error?


I guess Sitecore.Xdb.config file was corrupted and not the one expected in your Sitecore 9.1 instance,

Because In Sitecore 8.1 Sitecore.Xdb.config file contains the below pipeline entry,

        <processor type="Sitecore.Analytics.Pipelines.Initialize.ShowXdbInfo, Sitecore.Analytics" patch:after="processor[@type='Sitecore.Pipelines.Loader.ShowVersion, Sitecore.Kernel']"/>

But when you check the Sitecore 9.1 Sitecore.Xdb.config file, the same pipeline is moved to Sitecore.Xdb.Configuration. When you execute the upgrade steps this might have taken care.

                <processor type="Sitecore.Xdb.Configuration.Pipelines.Initialize.ShowXdbInfo, **Sitecore.Xdb.Configuration**" patch:after="processor[@type='Sitecore.Pipelines.Loader.ShowVersion, Sitecore.Kernel']" />

So the error you report here is regarding the Sitecore.Xdb.Configuration.Pipelines.Initialize.ShowXdbInfo which is moved from Sitecore.Analytics dll to Sitecore.Xdb.Configuration. But your config is not updated properly or your custom config is overwriting this somewhere [not sure].

Check the Sitecore.Xdb.config and look for any patch file which overwrites this entry [if any] that might be the root cause for the issue you reported.

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