PowerShell PnP sort SharePoint choice column failing

Question

This code worked for about last 2 months, then is now failing:

Connect-PnPOnline -Url "https://myco.sharepoint.com/sites/sandbox" -UseWebLogin

$listsToAdd = @("Structure Reqs","Perm Mods")

ForEach ($listToAdd in $listsToAdd)
{
$field = Get-PnPField -List $listToAdd -Identity "MyTargetColumn"
$ctx = Get-PnPContext

$fieldChoice = [Microsoft.SharePoint.Client.ClientContext].GetMethod("CastTo").MakeGenericMethod([Microsoft.SharePoint.Client.FieldChoice]).Invoke($ctx,$field)

$ctx.Load($fieldChoice)
Invoke-PnPQuery

$choices = $fieldChoice.Choices
$choices += "MyNewValue".ToUpper()

$fieldChoice.Choices = $choices | Sort-Object

$fieldChoice.UpdateAndPushChanges($true)
Invoke-PnPQuery
}

*** Error message is:

Exception calling "Invoke" with "2" argument(s): "Object does not match target type."
At line:14 char:1

• $fieldChoice = [Microsoft.SharePoint.Client.ClientContext].GetMethod( ...
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : NotSpecified: (:) [], MethodInvocationException
• FullyQualifiedErrorId : TargetException

Cannot find an overload for "Load" and the argument count: "1".
At line:16 char:1

• $ctx.Load($fieldChoice)
• ~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : NotSpecified: (:) [], MethodException
• FullyQualifiedErrorId : MethodCountCouldNotFindBest

The property 'Choices' cannot be found on this object. Verify that the property exists and can be set.
At line:22 char:1

• $fieldChoice.Choices = $choices | Sort-Object
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation: (:) [], RuntimeException
• FullyQualifiedErrorId : PropertyNotFound

You cannot call a method on a null-valued expression.
At line:24 char:1

• $fieldChoice.UpdateAndPushChanges($true)
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation: (:) [], RuntimeException
• FullyQualifiedErrorId : InvokeMethodOnNull

Exception calling "Invoke" with "2" argument(s): "Object does not match target type."
At line:14 char:1

• $fieldChoice = [Microsoft.SharePoint.Client.ClientContext].GetMethod( ...
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : NotSpecified: (:) [], MethodInvocationException
• FullyQualifiedErrorId : TargetException

Cannot find an overload for "Load" and the argument count: "1".
At line:16 char:1

• $ctx.Load($fieldChoice)
• ~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : NotSpecified: (:) [], MethodException
• FullyQualifiedErrorId : MethodCountCouldNotFindBest

The property 'Choices' cannot be found on this object. Verify that the property exists and can be set.
At line:22 char:1

• $fieldChoice.Choices = $choices | Sort-Object
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation: (:) [], RuntimeException
• FullyQualifiedErrorId : PropertyNotFound

You cannot call a method on a null-valued expression.
At line:24 char:1

• $fieldChoice.UpdateAndPushChanges($true)
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation: (:) [], RuntimeException
• FullyQualifiedErrorId : InvokeMethodOnNull

Answer 1

Thank you...looks like I had to delete SharePoint GAC, restart, and re-install PnP Online and it started working.

Answer 2

What PnP version do you have?

Answer 3

The code you shared works well in my environment.

You could try to create a new list with a choice column,then run the code again.