NGWS SDK Documentation  

This is preliminary documentation and subject to change.
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Automation object doesn't have a default value (Error 443)

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:

For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).