Get-DSCResource Error

This topic contains 8 replies, has 4 voices, and was last updated by Profile photo of John Drake John Drake 2 years, 11 months ago.

  • Author
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  • #15338
    Profile photo of John Drake
    John Drake
    Participant

    If I get an error mentioning v1.0 when running Get-DSCResource for the first time in PowerShell v4 (as shown below) can you tell me what I am doing wrong? (This is on x64 Windows 7 and I'm working through the DSC eBook.) Thanks.

    PS C:\Program Files\WindowsPowerShell\modules> get-dscresource
    Get-Command : Object reference not set to an instance of an object.
    At
    C:\windows\system32\windowspowershell\v1.0\Modules\PSDesiredStateConfiguration\PSDesiredStateConfiguration.psm1:2261
    char:27
    + $resources += Get-Command -CommandType Configuration | ForEach-Objec ...
    + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo : NotSpecified: (:) [Get-Command], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetCommandCommand

    PS C:\Program Files\WindowsPowerShell\modules> $psversiontable

    Name Value
    —- —–
    PSVersion 4.0
    WSManStackVersion 3.0
    SerializationVersion 1.1.0.1
    CLRVersion 4.0.30319.18444
    BuildVersion 6.3.9600.16406
    PSCompatibleVersions {1.0, 2.0, 3.0, 4.0}
    PSRemotingProtocolVersion 2.2

  • #15339
    Profile photo of Dave Wyatt
    Dave Wyatt
    Moderator

    Microsoft included "v1.0" in the default path to PowerShell's installation directory originally, and now they're sort of stuck with it. You can ignore that part.

    That said, I'm not sure what's causing the actual error here. I don't see anything there that looks like it should be able to produce a null reference exception.

  • #15340
    Profile photo of John Drake
    John Drake
    Participant

    Thanks Dave. It looks like it is an issue running get-command rather than an issue running get-dscresource. I've only recently upgraded to v4. I do have SQL Server on this machine, which may have some bearing on this.

    PS C:\Program Files\WindowsPowerShell\Modules> get-command
    get-command : Object reference not set to an instance of an object.
    At line:1 char:1
    + get-command
    + ~~~~~~~~~~~
    + CategoryInfo : NotSpecified: (:) [Get-Command], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetCommandCommand

  • #15344
    Profile photo of Don Jones
    Don Jones
    Keymaster

    Is KB2883200 installed?

  • #15345
    Profile photo of John Drake
    John Drake
    Participant

    Don, thanks, no I don't see it. I'm on Windows 7 (x64) not Windows 8.1. BTW, I don't think this is a DSC issue, I need to get get-command working.

  • #15350
    Profile photo of Daniel Krebs
    Daniel Krebs
    Participant

    John,

    Uninstalling the Windows Management Framework 4.0 (KB2819745) and reinstalling it (http://www.microsoft.com/en-gb/download/details.aspx?id=40855) after a restart might work for you on your Win7 machine.

  • #15357
    Profile photo of John Drake
    John Drake
    Participant

    Daniel, thanks, I'm trying this now. I'm not feeling very confident, because when WMF4 was uninstalled I could bring up the v3 ISE but get-command gave a similar error.

    PS C:\Users\John> $psversiontable
    get-command
    show-command

    Name Value
    —- —–
    PSVersion 3.0
    WSManStackVersion 3.0
    SerializationVersion 1.1.0.1
    CLRVersion 4.0.30319.18444
    BuildVersion 6.2.9200.16481
    PSCompatibleVersions {1.0, 2.0, 3.0}
    PSRemotingProtocolVersion 2.2
    get-command : Object reference not set to an instance of an object.
    At line:2 char:1
    + get-command
    + ~~~~~~~~~~~
    + CategoryInfo : NotSpecified: (:) [Get-Command], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetCommandCommand

    get-command : Object reference not set to an instance of an object.
    At line:1 char:3
    + @(get-command -CommandType Cmdlet,Function,Script,ExternalScript,Workflow),@(get ...
    + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo : NotSpecified: (:) [Get-Command], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetCommandCommand

  • #15359
    Profile photo of John Drake
    John Drake
    Participant

    Uninstalling then reinstalling WMF4 did not fix get-command, which still errors, details below. Has anyone got any ideas what I may be doing wrong? This is on Windows 7 SP1 x64. We can probably close this topic, as I've raised another under "PowerShell Repair?" in the Q&A forum. [The issue is with get-command erroring, which is why Get-DSCResource is not working.]

    PS C:\Users\John> $psversiontable

    Name Value
    —- —–
    PSVersion 4.0
    WSManStackVersion 3.0
    SerializationVersion 1.1.0.1
    CLRVersion 4.0.30319.18444
    BuildVersion 6.3.9600.16406
    PSCompatibleVersions {1.0, 2.0, 3.0, 4.0}
    PSRemotingProtocolVersion 2.2

    PS C:\Users\John> get-command
    get-command : Object reference not set to an instance of an object.
    At line:1 char:1
    + get-command
    + ~~~~~~~~~~~
    + CategoryInfo : NotSpecified: (:) [Get-Command], NullReferenceException
    + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetCommandCommand

  • #15497
    Profile photo of John Drake
    John Drake
    Participant

    This advice from Dave Wyatt fixed both get-command and Get-DSCResource on my machine, thank you all for your help

    "Next, I'd try the modules. A quick way of seeing if this will be helpful is to rename your My Documents\WindowsPowerShell\Modules folder, launch PowerShell, and try Get-Command again. If it works, then you can try creating a new Modules folder and moving them in a few at a time. Hopefully, you'll be able to identify one or more modules that are triggering this problem with Get-Command."

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