InfoPath Dev

Hi, the turst setting in Form Options is full trust? What do you mean by what kind of data connection?

 Whenever I click the preview form button I get the message below: InfoPath cannot create a new, blank form. The form template is not valid. The following DataObject either cannot be created or cannot be initialized: VIEW_ACTIVE_SYSTEM_NAMES The query cannot be run for the following DataObject: VIEW_ACTIVE_SYSTEM_NAMES InfoPath cannot run ...