Script to retrieve GPO settings into Excel Spreadsheet

All,

 I am currently using the script in the link below to retrieve some settings from Group Policy Objects. Here is the link:

http://syswow.blogspot.com/2012/06/group-policy-status-excel-report.html

I keep getting the error: "cannot call a method on a null-valued expression". I am trying to retrieve information such as:

1. Domain

2. GPO Name

3. Policy Path e.g Computer Configuration\Policicies\Windows Settings\Account Policies\Password Policy

4. Policy Setting Name e.g Enforce Password History

5. Policy Links e.g to scope of management (SOM) like OU, Domain, or Site?

from our group policy objects in our domain environment. Any help will be much appreciated:

Thanks,