title: Azure AzVMCustomScriptExtension hangs forever with warning message
body: <p>Using the following script to update a vm with a custom script, I got the a warning message and the command hangs forever.
  I don't see where the error could be.</p>
  <p>My script would look like the following</p>
  <pre><code>Set-AzVMCustomScriptExtension -Location &quot;LOCATION&quot; -VMName &quot;VMNAME&quot; -Name &quot;EXTENTIONNAME&quot; -StorageAccountName &quot;STOTRAGEACCOUNTNAME&quot; -StorageAccountKey &quot;XXXXXX&quot; -FileName &quot;SCRIPTNAME.ps1&quot; -ContainerName &quot;CONTAINERNAME&quot;| Update-AzVM -Verbose
  </code></pre>
  <p>WARNING message :</p>
  <pre><code>AVERTISSEMENT : No Run File has been assigned, and the Custom Script extension will try to use the first specified File
  </code></pre>
  <p>Name as the Run File.</p>