"...has no receiver! Are you missing a component?"

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I resolved the issues by disabling the default Animator of Enemy\Zombie1 at Hierarchy:

Unity - Disable the Zombie original Animator

At Hierarchy, \Enemy\Zombie1 where \Enemy already had the Animator Controller set to Enemy and Avatar set to “Zombie1Avatar”, I just removed the Animator Controller under \Enemy\Zombie1.

For better referencing, here is the lecture screen:

Unity - Lecturer Animator Controller
Unity - Lecturer Animator Controller1926×1030 336 KB

Hopes, this help.