After creating a new list item in the workspace list to create a new site the process runs in error occured. You get this error message in the uls log:
Solutions2Share.Solutions.CollaborationManager.EventReceivers.GroupPermissionChoiceFieldEventReceiver.ItemUpdating: Field type CM_PictureField is not installed properly. Go to the list settings page to delete this field. ExceptionType: 'SPException' ExceptionMessage: 'Field type CM_PictureField is not installed properly. Go to the list settings page to delete this field. ' StackTrace: '
at Microsoft.SharePoint.SPFieldCollection.CreateSPFieldFromSafeArray(Int32 index)
at Microsoft.SharePoint.SPFieldCollection.EnsureSPField(Int32 index)
at Microsoft.SharePoint.SPFieldCollection.ItemAtIndex(Int32 iIndex)
at Microsoft.SharePoint.SPContentType.get_Fields()
at Solutions2Share.Solutions.CollaborationManager.EventReceivers.GroupPermissionChoiceFieldEventReceiver.ItemUpdating(SPItemEventProperties properties)' Source: 'Microsoft.SharePoint' TargetSite: 'Microsoft.SharePoint.SPField CreateSPFieldFromSafeArray(Int32)'
After the installation from < 2.1 you forgot the iisreset on the web front end server.
Perform an iisreset on all servers to register the new custom field type.