VAMT 3.0 error event

Hi,

we are using without problem a VAMT 2.0 on a KMS server for Office 2010 activation.

Now we would like to use a VAMT 3.0 on a second KMS server for Office 2013 activation.

But when I try to activate the first Office 2013 we receive this error:

Volume Activation Management Tool
VAMT Runtime
1000
Error operating on product:
 Application Name: Office

. Exception System.Runtime.InteropServices.COMException (0xC004F074)
   in System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
   in System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
   in System.Management.ManagementObject.InvokeMethod(String methodName, ManagementBaseObject inParameters, InvokeMethodOptions options)
   in Microsoft.Licensing.VolumeActivation.WmiConnection.ExecuteMethod(String queryString, String actionValue, Dictionary`2 wmiParameter)
   in Microsoft.Licensing.VolumeActivation.SoftwareLicensingProvider.ActivateProduct(Product product)
   in Microsoft.Licensing.VolumeActivation.SoftwareLicensingProvider.VolumeActivate(Product product)
   in Microsoft.Licensing.VolumeActivation.VolumeActivationWorker.OnDoWork(Product product)
   in Microsoft.Licensing.VolumeActivation.WmiProviderWorker.Work()

How can I solve this?

Regards,

D.