Delete Project Parameter from model

Hello Guys,

I am trying to create dynamo to delete unwanted project parameters from revit model.
I have prepared below dynamo script, but it is not working.
Could you please help me?

FYI: I am using Dynamo 1.2 & Revit 2015.

Thank you for your co-operation.

Deleter Project Parameter_WIP.dyn (7.6 KB)