Not a PUBLIC member

You referred to a variable, property, function, or sub that was defined as a Private member of a class. Private members are not visible outside of the class to which they belong. For example: 

Class MyClass
  X As Integer				' X is Private by default.
  Private Function Z As Integer
  '...
  End Function
End Class
Dim varV As Variant
Set varV = New MyClass
varV.X% = 10					' Illegal: X is Private.
anInt% = varV.Z%				' Illegal: Z is Private.

Remove the reference or, if possible, change the definition of the class member from Private to Public.