Sitecore Powershell Extension throws null-valued expression exception

Question

On a fresh Windows VM I installed powershell extensions module:

Install-Module SPE

Then I am trying to invoke a remote script on my sitecore instance:

$url = "https://my-sitecore.azurewebsites.net"
$session = New-ScriptSession -Username admin -Password b -ConnectionUri $url
Invoke-RemoteScript -Session $session -ScriptBlock { Write-Host "Foo" }

But it fails with

You cannot call a method on a null-valued expression. At C:Program
  FilesWindowsPowerShellModulesSPE6.0.0Invoke-RemoteScript.ps1:344
  char:21
  +                     $taskResult.Content.ReadAsStringAsync().Result
  +                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
      + FullyQualifiedErrorId : InvokeMethodOnNull

How can I fix it?

JleruOHeP · Answer

Apparently, the error was because of different versions of SPE installed locally and on the sitecore instance.

I used a sitecore vanila package with pre-installed SPE and a couple of extra packages and the SPE version was 5.0

Locally I used the latest - 6.0 and they are not backward compatible!
But from the good news - SPE 5.0 works with sitecore 9.2

To solve the issue I had to downgrade installed SPE:

Remove-Package SPE
Uninstall-Package SPE
Install-Package -Name SPE -RequiredVersion 5.0

Vlad Iobagiu · Answer

This type of error appears when you have an undeclared (null) variable.
For me looks like $session is null .

Can you update your script in this way:

$session = New-ScriptSession -Username "admin" -Password "b" -ConnectionUri $url

Sitecore Powershell Extension throws null-valued expression exception

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