I take the liberty of posting here as there are no V5 forums yet.

I am trying to create and assign a new CSS Stylesheet to the Corporate Site getting the following error

Object reference not set to an instance of an object.

I create a New CSS Stylesheet

DisplayName: Hammars
CodeName: Hammars
Text: I paste the text from "Corporate Site" without modifications
Assign to "My WebSite" is checked.

I change to the new CSS in the Site Manager and get this error.

Details:
[NullReferenceException: Object reference not set to an instance of an object.]
CMS.GlobalHelper.UIHelper.GetImageUrl(Page page, String imagePath, Boolean isLiveSite, Boolean ensureDefaultTheme) +439
CMS.GlobalHelper.UIHelper.GetImageUrl(Page page, String imagePath) +9
CMS.PortalControls.CMSAbstractWebPart.GetImageUrl(String imagePath) +20
CMSWebParts_Ecommerce_ShoppingCartMiniPreviewWebPart.get_IconImageUrl() +38
CMSWebParts_Ecommerce_ShoppingCartMiniPreviewWebPart.SetupControl() +39
CMSWebParts_Ecommerce_ShoppingCartMiniPreviewWebPart.OnContentLoaded() +12
CMS.PortalControls.CMSWebPartZone.OnContentLoaded() +135
CMS.PortalControls.CMSAbstractLayout.OnContentLoaded() +125
CMS.PortalControls.CMSAbstractLayout.LoadContent(PageInfo pageInfo, Boolean reloadData, Boolean allowOrphanedZones) +1058
CMS.PortalControls.CMSPagePlaceholder.LoadContent(PageInfo pageInfo, Boolean reloadData) +1098
CMS.PortalControls.CMSPortalManager.LoadContent(Boolean reloadData) +960
CMS.PortalControls.CMSPortalManager.CMSPortalManager_Init(Object sender, EventArgs e) +76
System.Web.UI.Control.OnInit(EventArgs e) +99
System.Web.UI.Control.InitRecursive(Control namingContainer) +333
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378