Failed to reserve $xbp file in Vista! Error: File object already reserved.


When trying to open/edit a XBuilder project in workstation the following error is given:

Product Line

TAC Vista


  • TAC Vista Workstation
  • TAC Vista XBuilder


Vista has multiple instances of the same XBuilder project open at the same time. For some reason if a XBuilder project opened from Workstation was not closed normally, workstation will not allow the user to open/edit the XBuilder project.


First, check if there is already a XBuilder window open. If there the same project is already open then close the window. If there is no other XBuilder window open then follow these steps:

  1. Close TAC Vista Workstation and Server
  2. Restart TAC Vista Server and Workstation.

After the reboot the user should be able to open XBuilder editor.