You are missing an icon for your script extension. Add an icon file and then reference it in your description.xml file. Once you do that you will no longer get the error that crashes TestComplete.
Currently your description file has
<KDTOperation Name = "HNB Property Checkpoint" Category = "Checkpoints" Icon = "">
Once I added an icon file Test Complete no longer crashed. You still have errors in your script extension but at least you will be able to see those and will be able to start working through them.
Hope that helps.