The cluster input to a Bundle, Unbundle, Bundle By Name, or Unbundle By Name function on the block diagram is either not a cluster or is a cluster with no elements, and the Bundle, Unbundle, Bundle By Name, or Unbundle By Name function cannot find the names of any elements in the cluster.
To correct this error, make sure the data input is a cluster, and add named elements to the cluster.
If an item in the cluster is not named, add a name by right-clicking the item and selecting Visible Items»Label from the shortcut menu. A blank label appears, ready to accept input.
When the Bundle, Unbundle, Bundle By Name, or Unbundle By Name function has valid cluster inputs, the individual element terminal of the function contains the name of one of the cluster elements.
If the name that appears in an individual element terminal is black, the terminal is invalid.