One of the inputs to the Formula Node is not wired. LabVIEW does not know what value to use for the parameter. For example, in the following block diagram, the Y input parameter is not wired.

You can correct this error in the following ways:

  • Wire a data input to the unwired input.
  • Remove the input from the node by right-clicking the input and selecting Remove from the shortcut menu. If you choose this option, you might have to remove any reference to this parameter from the formula or script.