ID:12009 Node "<name>" is missing source

CAUSE: A node is connected to one or more destinations but does not have a source. This error can also occur if you have not correctly named a node that is connected to a bus in a Graphic Design File (.gdf) or Block Design File (.bdf). This error can also occur if you added a node into the SignalTap II File used for compilation and this node does not have a source.

ACTION: Connect the node to the output of a logic function. If you want to use the default unconnected input to a macrofunction, make sure that nothing is connected to the input of the macrofunction. If enabling the SignalTap II Logic Analyzer is the cause, then remove the node from the STP File.