Troxler Enhanced RoadReader Plus 3451 Manual Of Operation And Instruction page 204

No voidless density value exists!
This error can occur if the operator attempts to activate a voidless
density value but there is not one available.
Possible causes:
✓ The voidless density value has been deleted.
✓ No voidless density values were created.
No voidless density value selected!
This error can occur if the operator attempts to enable, disable,
view, or erase a voidless density value but does not select one.
Serial Port is not accessible!
Please close any programs that are using the serial port.
When the RoadReader Plus software is first turned on, it checks the
serial port to see if another program has control of it. If another
program has control, this error will occur. Exit the RoadReader Plus
software and perform the following to close out all other running
programs:
✓ Press Start and select Settings from the dropdown menu.
✓ Press the 〈System〉 button at the bottom of the display.
✓ Press the Memory icon.
✓ Press the 〈Running Programs〉 button at the bottom of the
display.
✓ Press the 〈Stop All〉 button to halt all programs currently
running in the PDA memory.
Special calibration name must be 20 chars or less!
This error can occur when performing a special calibration after the
operator is prompted for the special calibration name.
Possible causes:
✓ Name was greater than 20 characters long
✓ No name was entered
Model 3451 Appendix C–21