What should be specified in object reference field in the first step of sequence file in test stand

Test stand object Reference field- <The expression cannot be empty>
It is showing an error like "The .Net property can not be accessible
                                         Object Reference not set to an instance of an object".   
How it can be resolved?
Attachments:
ex1.jpg ‏2305 KB

I am
using Singleton Class in .Net. So I need not create object in TestStand. The Get
property of the class will return its own class object. So the Class Reference
should be empty only.
When I
choose the property manually, I am getting this error. This I am getting only
when I create this step through C# TestStand APIs. Please help me to remove this
error in the Class Reference field using TestStand
APIs.
Attachments:
ex2.jpg ‏24 KB

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