Fetching Doc type in Contract Create

Hi Experts,

I am facing the problem during fetching the document type of current document in Contract Create script.

My requirement is, I want to restrict user from creating 1st document other than "Contract".

for this i need to fetch the doc type of current document.

I am using following piece of code in Contract Create script but it is throwing me an error.

I am unable to access netviewer JAVA logs due to some technical problem, so I am unable to paste complete log information.

Please help me with your expert comments.

Regards

Nishant