AutoCAD Warning: HP Designjet 800 42 by HP: This plotter configuration cannot be used. Either the driver cannot be found, the device cannot be found, or the driver has a problem. The None plot device has been substituted. AutoCAD Warning: HP Designjet 800 42 by HP: This plotter configuration cannot be used. Either the driver cannot be found, the device cannot be found, or the driver has a problem. The None plot device has been substituted.