You entered text for a unit that LabVIEW does not recognize. You might encounter this error when adding units to a control or block diagram constant or when configuring the Convert Unit function.
You cannot enter ambiguous units. For example, m/ss is ambiguous because it is not clear whether it means meters per second squared or (meters/seconds) × seconds.
You also cannot place the degC and degF units in the denominator. These units are derived units with nonlinear conversion from the base unit.
To correct this error, right-click the unit label and select Build Unit String from the shortcut menu to display the Build Unit String dialog box. Enter a unit using correct abbreviations and syntax. For example, use a space to indicate multiplication and use a forward slash (/) to indicate division.