How to Define a new type in vb.net

I purchased an add on to vb.net to read from a network device.  Its ingeardrivers if that matters.  They have some example code and it works, but I am trying to create a copy of the program, and I run into this below.  
   
 Dim tagGroup As New TagGroup  (in the program I have created this says TagGroup is not defined but it works fine in the example program.  

I copied the code on the example program, and I have added the references of the example program, but this line has an error in my code.  How do I find where this is addressed in the example program.  I have dug through everything I can find, but don't know what I am doing wrong.
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Tom_HickersonAsked:
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Najam UddinCommented:
Did you add reference required dll
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käµfm³d 👽Commented:
Have you imported the correct namespace for that class? If you put the caret on TagGroup, then click Ctrl-period, you should get suggestions on how you can fix the issue. If importing a namespace isn't one of those options, then you've got other issues.
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