Error "You cannot call a method on a null-valued expression." about locksmith HOT 21 CLOSED

PS C:\Users\***\Desktop> .\Invoke-Locksmith.ps1
Get-ADForest : The term 'Get-ADForest' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:75 char:22
+ $DNSRoot = [string]((Get-ADForest).RootDomain | Get-ADDomain).DNSRoot
+                      ~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-ADForest:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Get-ADForest : The term 'Get-ADForest' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:76 char:35
+ $EnterpriseAdminsSID = ([string]((Get-ADForest).RootDomain | Get-ADDo ...
+                                   ~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-ADForest:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

New-Object : A constructor was not found. Cannot find an appropriate constructor for type
System.Security.Principal.SecurityIdentifier.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:77 char:19
+ ... rredOwner = New-Object System.Security.Principal.SecurityIdentifier($ ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (:) [New-Object], PSArgumentException
    + FullyQualifiedErrorId : CannotFindAppropriateCtor,Microsoft.PowerShell.Commands.NewObjectCommand


Get-ADForest : The term 'Get-ADForest' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:114 char:25
+             $Targets = (Get-ADForest).Name
+                         ~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-ADForest:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Install-WindowsFeature : The term 'Install-WindowsFeature' is not recognized as the name of a cmdlet, function, script
file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct
and try again.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:632 char:5
+     Install-WindowsFeature -Name RSAT-AD-PowerShell
+     ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Install-WindowsFeature:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException


Gathering AD CS Objects from ...
Get-ADCSObject : Cannot bind argument to parameter 'Targets' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:646 char:44
+     $ADCSObjects = Get-ADCSObject -Targets $Targets
+                                            ~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-ADCSObject], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Get-ADCSObject

Set-AdditionalCAProperty : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:647 char:43
+     Set-AdditionalCAProperty -ADCSObjects $ADCSObjects
+                                           ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Set-AdditionalCAProperty], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Set-AdditionalCAProperty

Get-CAHostObject : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:648 char:51
+     $ADCSObjects += Get-CAHostObject -ADCSObjects $ADCSObjects
+                                                   ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-CAHostObject], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Get-CAHostObject

Get-CAHostObject : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:649 char:46
+     $CAHosts = Get-CAHostObject -ADCSObjects $ADCSObjects
+                                              ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-CAHostObject], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Get-CAHostObject

The property 'Name' cannot be found on this object. Verify that the property exists.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:650 char:33
+     $CAHosts | ForEach-Object { $SafeUsers += '|' + $_.Name }
+                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], PropertyNotFoundException
    + FullyQualifiedErrorId : PropertyNotFoundStrict


Identifying auditing issues...
Find-AuditingIssue : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:656 char:58
+ [array]$AuditingIssues = Find-AuditingIssue -ADCSObjects $ADCSObjects
+                                                          ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-AuditingIssue], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-AuditingIssue


Identifying AD CS templates with dangerous configurations...
Find-ESC1 : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:661 char:39
+ [array]$ESC1 = Find-ESC1 -ADCSObjects $ADCSObjects -SafeUsers $SafeUs ...
+                                       ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-ESC1], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-ESC1

Find-ESC2 : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:662 char:39
+ [array]$ESC2 = Find-ESC2 -ADCSObjects $ADCSObjects -SafeUsers $SafeUs ...
+                                       ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-ESC2], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-ESC2


Identifying AD CS template and other objects with poor access control...
Find-ESC4 : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:667 char:39
+ [array]$ESC4 = Find-ESC4 -ADCSObjects $ADCSObjects -SafeUsers $SafeUs ...
+                                       ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-ESC4], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-ESC4

Find-ESC5 : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:668 char:39
+ [array]$ESC5 = Find-ESC5 -ADCSObjects $ADCSObjects -SafeUsers $SafeUs ...
+                                       ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-ESC5], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-ESC5

Find-ESC6 : Cannot bind argument to parameter 'ADCSObjects' because it is null.
At C:\Users\***\Desktop\Invoke-Locksmith.ps1:669 char:39
+ [array]$ESC6 = Find-ESC6 -ADCSObjects $ADCSObjects
+                                       ~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Find-ESC6], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Find-ESC6