Visual Basic for Applications Reference
Automation object doesn't have a default value (Error 443)
See Also Specifics
When you specify an object name without a property or method, Visual Basic assumes you are referencing the object's default member (property or method). However, not all objects expose a default member. This error has the following cause and solution:
Visual Basic can't determine the default member for the specified object.
Check the object's documentation and give an explicit specification for the property or method.
For additional information, select the item in question and press F1.