问PowerShell未将新建项目对象引用设置为对象实例

EN

function set-drvsource{
    Write-Host "INFO: Querying Driver Source" -ForegroundColor Yellow
    }
    try{
        Write-Host "INFO: Creating standard folder structure" -ForegroundColor Yellow
        New-Item -ItemType Directory -Path "$drvpath" | Out-Null
        New-Item -ItemType Directory -Path "$drvpath\Source" | Out-Null
        New-Item -ItemType Directory -Path "$drvpath\Package" | Out-Null
    }
    catch{
        Write-Host "ERROR: Could not create folder structure" -ForegroundColor Red
        Exit
    }
    Write-Host "INFO: Moving local source to new source" -ForegroundColor Yellow
    Copy-Item $src "$drvpath\Source" -Recurse
}
function main{
    set-drvsource
}
$drvroot = "\\server\share\tmp"
$src = Read-Host "Please provide local driver source path"
$vendor = Read-Host "Device Vendor eg. DELL, HP, Microsoft"
$dmd = Read-Host "Device Model eg. HP Elitebook 840 G3"
$dos = Read-Host "Operating System eg. W7 or W10"
$dac = Read-Host "x64 or x86"
$drvpath = "$drvroot\$vendor\$dmd $dos $dac"

$Error[0]
New-Item : Object reference not set to an instance of an object.
At line:9 char:1
+ New-Item -ItemType Directory -Path "$drvpath" | Out-Null
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [New-Item], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.NewI 
   temCommand

$drvroot = "\\server\share\tmp"
$vendor = Read-Host "Vendor"
$dmd = Read-Host "Device Model eg. HP Elitebook 840 G3"
$dos = Read-Host "Operating System eg. W7 or W10"
$dac = Read-Host "x64 or x86"
$drvpath = "$drvroot\$vendor\$dmd $dos $dac"
New-Item -ItemType Directory -Path "$drvpath" | Out-Null
New-Item -ItemType Directory -Path "$drvpath\Source" | Out-Null
New-Item -ItemType Directory -Path "$drvpath\Package" | Out-Null

Exception             : System.NullReferenceException: Object reference not 
                        set to an instance of an object.
                           at Microsoft.ConfigurationManagement.PowerShell.Prov
                        ider.CMDriveProvider.NewItem(String path, String 
                        itemTypeName, Object newItemValue)
                           at System.Management.Automation.SessionStateInternal
                        .NewItemPrivate(CmdletProvider providerInstance, 
                        String path, String type, Object content, 
                        CmdletProviderContext context)
TargetObject          : 
CategoryInfo          : NotSpecified: (:) [New-Item], NullReferenceException
FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Comm
                        ands.NewItemCommand
ErrorDetails          : 
InvocationInfo        : System.Management.Automation.InvocationInfo
ScriptStackTrace      : at set-drvsource, C:\temp\quick
                        import_cli-1.1\quickimport_cli-1.1\Invoke-QuickImport.p
                        s1: line 51
                        at main, C:\temp\quickimport_cl
                        i-1.1\quickimport_cli-1.1\Invoke-QuickImport.ps1: line 
                        101
                        at <ScriptBlock>, C:\temp\quick
                        import_cli-1.1\quickimport_cli-1.1\Invoke-QuickImport.p
                        s1: line 165
PipelineIterationInfo : {}
PSMessageDetails      :