VERBOSE: [20/03/2014 9:12:07 AM] Getting list of servers from Active Directory
VERBOSE: [20/03/2014 9:12:09 AM] Loading SCOM SnapIn
VERBOSE: [20/03/2014 9:12:09 AM] Connecting to SCOM RMS Server: PRD-SCOMMS01
VERBOSE: [20/03/2014 9:12:10 AM] Connecting to SCOM Provider
VERBOSE: [20/03/2014 9:12:10 AM] Connecting to SCOM Server: PRD-SCOMMS01
VERBOSE: [20/03/2014 9:12:16 AM] Gathering all SCOM managed systems
VERBOSE: [20/03/2014 9:12:18 AM] Filtering out all Non SCOM managed systems to
audit
VERBOSE: [20/03/2014 9:12:18 AM] Configuring SCOM discovery prior to use
New-WindowsDiscoveryConfiguration : Cannot validate argument on parameter
'ComputerName'. The argument is null or empty. Provide an argument that is not
null or empty, and then try the command again.
At C:\Scripts\SCOMAgentAudit.ps1:91 char:61
+ $Discover = New-WindowsDiscoveryConfiguration -ComputerName $NonSCOM
-PerformVer ...
+                                                             ~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [New-WindowsDiscoveryConfigurat
   ion], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Enter
   priseManagement.OperationsManager.ClientShell.NewWindowsDiscoveryConfigura
  tionCmdlet

You cannot call a method on a null-valued expression.
At C:\Scripts\SCOMAgentAudit.ps1:92 char:1
+ $Discover.ComputerNameDiscoveryCriteria.getComputernames() | ForEach
{Write-Verb ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

VERBOSE: [20/03/2014 9:12:18 AM] Beginning SCOM discovery
Start-Discovery : Cannot validate argument on parameter
'WindowsDiscoveryConfiguration'. The argument is null or empty. Provide an
argument that is not null or empty, and then try the command again.
At C:\Scripts\SCOMAgentAudit.ps1:94 char:65
+ $DiscResults = @(Start-Discovery -WindowsDiscoveryConfiguration $Discover
-Manag ...
+                                                                 ~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Start-Discovery], ParameterBin
   dingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Enter
   priseManagement.OperationsManager.ClientShell.StartDiscoveryCmdlet

VERBOSE: [20/03/2014 9:12:18 AM] Checking for failed Discoveries
VERBOSE: [20/03/2014 9:12:18 AM] Beginning installation of SCOM Agent on
discovered systems
VERBOSE: : Attempting Agent Installation
Install-Agent : Cannot bind argument to parameter 'ManagementServer' because
it is null.
At C:\Scripts\SCOMAgentAudit.ps1:135 char:44
+ $Results = Install-Agent -ManagementServer $MgmtServer
-AgentManagedComputer: $D ...
+                                            ~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Install-Agent], ParameterBindi
   ngValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,M
   icrosoft.EnterpriseManagement.OperationsManager.ClientShell.InstallAgentMa
  nagedComputerCmdlet

VERBOSE: [20/03/2014 9:12:18 AM] Checking for Failed and Successful
installations
Index operation failed; the array index evaluated to null.
At C:\Scripts\SCOMAgentAudit.ps1:145 char:9
+         $FailedInstall[([xml]$result.Output).DataItem.PrincipalName] = `
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArrayIndex

PS C:\Scripts>