Exchange 2010 product key Error

Greetings,

I have finished the Exchange 2010 installation. I start the exchange management console and try to register my exchange.

I have the following error :
You must provide a value for this property.

I took a look into my event log and this is my error:

Cmdlet failed. Cmdlet Set-ExchangeServer, parameters {Identity=servername, ProductKey=xxxxx-xxxxx-xxxxx-xxxxx-xxxxx}

If I try to register my exchange manually using the powershell this is my error:

[PS] C:\Windows\system32>Set-ExchangeServer -Identity gutenberg -ProductKey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
You must provide a value for this property.
    + CategoryInfo          : NotSpecified: (0:Int32) [Set-ExchangeServer], DataValidationException
    + FullyQualifiedErrorId : 3E162378,Microsoft.Exchange.Management.SystemConfigurationTasks.SetExchangeServer