D7 (W2008, IIS7, SQL Server Express): Cannot insert the value NULL into column 'id', table 'drupal_dvl.dbo.weather_location

Hi All,

as I am new to the community and recently started to learn Drupal and the usage of it, I followed some examples on the internet.
One of these examples was installing the module "Weather".
The installation of this module, on an W2008, IIS7 & SQL Server Express database worked as a charm.

However, when I try to add a location i get the following error:

PDOException: SQLSTATE[23000]: [Microsoft][SQL Server Native Client 10.0][SQL Server]Cannot insert the value NULL into column 'id', table 'drupal_dvl.dbo.weather_location'; column does not allow nulls. INSERT fails. in drupal_write_record() (line 6776 of C:\inetpub\wwwroot\drupal_dvl\includes\common.inc)...

Could this be related to my installation of Drupal 7 or the creation of the weather db on an SQL server express database ?

All tips are helpful and I hope I post this "error" in the right section.

Kind regards,
Karel