Cannot update Antimalware config using Powershell on Azure VM

Hi,

I'm trying to update the antimalware configuration on an Azure VM. I have created the JSON file and following the instructions herehttps://msdn.microsoft.com/library/azure/dn771716.aspx

I'm running the command however getting an error. Any help please?

Get-AzureVM-ServiceName$VMServiceName-Name$VMName|Set-AzureVMMicrosoftAntimalwareExtension-AntimalwareConfigFile$AVConfigFile|Update-AzureVM

Thanks in advance.