Any help here is greatly appreciated - I can also zip up the files if someone wants to try and run them locally.
c:\dev\HgSilver\_Provision\NebTestEnvironment>PowerShell .\_nuget\packages\psake.4.1.0\tools\psake.ps1 sampleScript.ps1 -parameters @{environmentNumber=0} 
psake version 4.1.0
Copyright (c) 2010 James Kovacs
Warning: Using global variable $framework to set .NET framework version used is deprecated. Ins
tead use Framework function or configuration file psake-config.ps1.
Executing Print-Properties
3/26/2012 4:19:10 PM: An Error Occurred: 
Assert: environmentNumber should not be null
At C:\dev\HgSilver\_Provision\NebTestEnvironment\_nuget\packages\psake.4.1.0\tools\psake.psm1:1
52 char:14
+         throw <<<<  ("Assert: " + $failureMessage) 
    + CategoryInfo          : OperationStopped: (Assert: environ...uld not be null:String) [], 
    RuntimeException
    + FullyQualifiedErrorId : Assert: environmentNumber should not be null