“Distribution Manager failed to access the source directory for Configuration Manager Client Piloting Package content” when trying to expand a SCCM Site

I am trying to expand my ConfigMgr Site but I’m getting a Status Message that says:

Distribution Manager failed to access the source directory for Configuration Manager Client Piloting Package content.

If I look in Distmgr.log I see the errors stating that Distribution Manager cannot locate the source for PilotUpgrade and cannot process the snapshot of the package.