Microsoft.SharePoint.Client.Web - The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

Hi all,

I'm really a novice at SP programming, but I went through most of the posts and even the basics doesn't look like to work for me.

I would like to upload some files to SP site.
For this reason I wrote (copied from everywhere :) ) the below script (I'm not even at the point of uploading file, I'm just trying to connect)

#Load SharePoint client dlls
    $a = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
    $ar = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
   
    if( !$a ){
        $a = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
    }
    if( !$ar ){
        $ar = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
    }
   
    if( !$a -or !$ar ){
        throw         "Could not load Microsoft.SharePoint.Client.dll or Microsoft.SharePoint.Client.Runtime.dll"
    }
$assemblies = @( $a.FullName, $ar.FullName,     "System.Core")

#Add overload to the client context.
#Define new load method without type argument
    $csharp =     "
      using Microsoft.SharePoint.Client;
      namespace SharepointClient
      {
          public class PSClientContext: ClientContext
          {
              public PSClientContext(string siteUrl)
                  : base(siteUrl)
              {
              }
              // need a plain Load method here, the base method is a generic method
              // which isn't supported in PowerShell.
              public void Load(ClientObject objectToLoad)
              {
                  base.Load(objectToLoad);
              }
          }
      }"

Add-Type -TypeDefinition $csharp -ReferencedAssemblies $assemblies
$site = "My-site-root"
$listname = "Certificates"

$context = New-Object Microsoft.SharePoint.Client.ClientContext($site)
[Microsoft.SharePoint.Client.Web]$web = $context.Web
[Microsoft.SharePoint.Client.List]$list = $web.Lists.GetByTitle($listName)
$context.executeQuery()

$web = $context.Web
$context.load($web)

When I run that I get 2 errors:

1. Load (which I thoght could be remediated by above $csharp code)

Cannot find an overload for "Load" and the argument count: "1".
At C:\temp\uploadCertToSharepoint.ps1:69 char:14
+ $context.load <<<< ($web)
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

2. $web variable is empty, however it seems that executeQuery is done, since in $context I see the server version, absent before executing the query

If I run a few lines in powershell
$context = New-Object Microsoft.SharePoint.Client.ClientContext($site)
$context.ExecuteQuery()
Either $context.web or $context.site return the error

format-default : The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.
    + CategoryInfo          : NotSpecified: (:) [format-default], CollectionNotInitializedException
    + FullyQualifiedErrorId : Microsoft.SharePoint.Client.CollectionNotInitializedException,Microsoft.PowerShell.Commands.FormatDefaultCommand

Can someone point me in the right direction please? What am I doing wrong?

Thanks,

Marco