Incomplete, Complete, and Failed Nodes
Incomplete Node
When you initially place a node on the graph, it will likely be in an incomplete state. This is depicted on the node with an "under construction" badge.
An incomplete node may also have one or more white input ports, which indicate that no values have been provided for these ports. To complete the port, you need to provide an input value.
Failed Node
A failed node displays with a failed badge. All of the input values have been provided, which is indicated by the black ports, but the node is not able to perform its technique correctly. This is almost always due to invalid input values, such as a value having the wrong data type, or an error in the formulation of the value.
