使用Powershell将文件上载到Sharepoint时出现突发错误

Question

我使用Powershell将图像（＆lt; 100kb）上传到SharePoint文档库。前30-40个文件完美上传，但突然之间我收到了这条消息：

Exception calling "UploadFile" with "3" argument(s): "An exception occurred during a WebClient request." At D:\SP01\Scripts\E_Zeitkonto\PSURLCapture\PSURLCapture.ps1:153 char:26
+     $WebClient.UploadFile <<<< ($UploadFullPath, "PUT", $LocalPath)
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

上传文件的代码是：

Function UploadToSPPictureLib($LocalPath, $spDocLibPath) 
{
    $UploadFullPath = $spDocLibPath + "/" + $(split-path -leaf $LocalPath) 
    $WebClient = new-object System.Net.WebClient 
    $WebClient.Credentials = [System.Net.CredentialCache]::DefaultCredentials 
    $WebClient.UploadFile($UploadFullPath, "PUT", $LocalPath)

    $WebClient.Dispose()
}

这里有什么不对？我错过了什么？