PowerShell cannot find overload

I am trying to use https://sshnet.codeplex.com/ to let a PowerShell script upload a file to an SFTP server. Everything seems to work, except that it cannot find the method overload UploadFile

and is lost.

Method definition here

TypeName   : Renci.SshNet.SftpClient
Name       : UploadFile
MemberType : Method
Definition : void UploadFile(System.IO.Stream input, string path, System.Action[uint64] uploadCallback),
             void UploadFile(System.IO.Stream input, string path, bool canOverride, System.Action[uint64] uploadCallback)

      

        
        
        
      

    

I am trying to use this overload

UploadFile(System.IO.Stream input, string path, System.Action[uint64] uploadCallback)

      

        
        
        
      

    

The field uploadCallback

is optional as per the documentation and not required in my simple script but even adds that on error. The ways I've tried calling this are as follows: they all fail.

How do I call one of these methods successfully? Examples of what I've tried are below.

<strong> Examples

$client = New-Object Renci.SshNet.SftpClient($ftpHost, $ftpPort, $ftpUser, $ftpPass)
$client.Connect()

# ... get stream of file to upload here ...

$client.UploadFile($sourceStream, "$ftpPath$output")

      

        
        
        
      

    

Crashing with

Cannot find an overload for "UploadFile" and the argument count: "2".
At F:\MyScript.ps1:170 char:2
+     $client.UploadFile($sourceStream, "$ftpPath$output")
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

      

        
        
        
      

    

The following attempts all fail with the same error message substantially

$action = [System.Action[uint64]]
$client.UploadFile($sourceStream, "$ftpPath$output", $action)

      

        
        
        
      

    

Mistake

Cannot find an overload for "UploadFile" and the argument count: "3".
At F:\MyScript.ps1:170 char:2
+     $client.UploadFile($sourceStream, "$ftpPath$output", $action)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

      

        
        
        
      

    

Trying with $null

third parameter

$client.UploadFile($sourceStream, "$ftpPath$output", $null)

      

        
        
        
      

    

Failed to execute

Cannot find an overload for "UploadFile" and the argument count: "3".
At F:\MyScript.ps1:169 char:2
+     $client.UploadFile($sourceStream, "$ftpPath$output", $null)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest