You obviously have a broken wire in that case. If you hover over that broken wire Context-Help on, it might give you a clue.
There are 2 possible causes.
1. You have a bundle node in there with an undefined input. Shrink the node to get rid of that bottom element you have nothing going into.
2. Your cluster doesn't seem to be a type def cluster. Turn it into one. In my opinion, every cluster and every enum in LabVIEW should be made into a type definition. If you don't, you'll eventually run into a problem particularly if you want to add another element to either, then you spend a lot of time fixing every location that cluster or enum is used. You have 3 possible places where that brown wire gets defined. The constant that initializes the shift register., the bundle cluster in the shown case that is broken itself for reason I said above, and in one more more other cases in that case structure.
If you wind up changing one thing, in any of those locations, you'll break your VI until you fix all the locations. With a typedef, you just have to change the typedef and other places will update automatically.
