Unhandled exception error using the Pitch Helix command

Hi all,

I am a new user of a software developer kit Pitch Helix. I am facing a problem. I want to select a circle but either picking it up from the center point or its diameter but i cat do it. When I select it from the axis button in the dialogue box, an error appears

Variable pitch thread

Unhandled exception has occurred in a component in your

application. If you click Continue, the application will ignore this error

and attempt to continue.

Object reference not set to an instance of an object.

Details                                                           Continue

I don't know why it happens so but I doubt it that this happens because of the profile selection which is not up to the mark.

Please study the image above. It might be of some help to you to answer the query.

If anybody has faced such a problem and then found a solution, please do let me know.

I am stuck at this point.

Waiting for your replies,

Regards,

Hiliary