The conditional terminal, or
, of this While Loop is not wired to anything and must be wired to a Boolean control.
You must wire a Boolean value to the conditional terminal to control if the loop stops or continues.
To correct this error, right-click the conditional terminal on the block diagram and select Create»Control from the shortcut menu to create a front panel Boolean control. Wire the Boolean control terminal to the conditional terminal.
Alternatively, you can place a Boolean constant on the block diagram and wire its terminal to the conditional terminal.