Custom Powershell Activity Issue

tiyasa · ‎10-11-2017

Hello,

I am trying to run a PowerShell script through a custom PowerShell activity in SN. When I test the inputs, I get the following output "Cannot bind argument to parameter 'String' because it is null.". No hresult and no errorMessages.

Can anyone suggest what this would mean and how can I resolve this?

Thanks,

~T

chadlockwood · ‎10-19-2017

tiyasa

Everything looks fine in the log, in so much as PowerShell is running and reporting correctly. I think that one/all of your object attributes is not being set correctly. How are you reading inputs in your PS code? I see that you are passing variables to the function, such as $password and $title, but I don't see where you are importing them from your workflow. Maybe I'm missing something, but you would need to include something like this:

Your custom activity has inputs called "password" and title. To get those into PowerShell, you need:

$password = $env:SNC_password

$title = $env:SNC_title

You could also do:

addListItem -password $env:SNC_password -title $env:SNC_title

The inputs in the activity are treated like environment variables and SNC_<variable_name> is how they are referenced in PowerShell. Without this part, none of your object attributes would be populated and it would return the error you see.

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adilrathore · ‎10-12-2017

Have you tested the script out of ServiceNow. Does it work manually. It seems that some argument is missing within the script.

tiyasa · ‎10-12-2017

Hi,

Yes, manually the script works perfectly.

tiyasa · ‎10-16-2017

chadlockwood - Can you suggest? your blog on PowerShell custom activity was very helpful.

adilrathore · ‎10-16-2017

Do you have the contents of the script.