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User Notification, "The culverts outlet coefficients are to be defined by the Stop Node, but that node is not a Headwall" occurs when the conduit downstream of the headwall is set to "Is Culvert?" = 'True' and the upstream headwall definition property is set to "Use Start Node" or set to "Use Conduit" with the headwall type defined. The downstream endwall type can be set to either "Use stop node" or "Use Conduit" and the end node is a catch basin.
With a headwall at the upstream end and a catch basin at the downstream end of your conduit with the properties set as above you'll have an improper configuration. As a workaround set the properties for the Culvert that is upstream of the catch basin to use a "Downstream Endwall Definition Type" of "Use Conduit" with a "Culvert Endwall" property type set to 0 degree wingwall flares with a Kr value of 0.00.The wingwall will provide little to no hydraulic friction loss and will be a valid configuration.
Headwalls