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Yes, you have defined the nodes, but I don't think you've connected them up properly. For the cooling coil outlet, here's what you have:

AirflowNetwork:Distribution:Node,
  Cooling Coil Air Outlet Node,  !- Name
  ,                              !- Component Name or Node Name
  Other,                         !- Component Object Type or Node Type
  1.5;                           !- Node Height {m}

And here is what the AirflowNetwork_MultiZone_House.idf example file has:

AirflowNetwork:Distribution:Node,
  CoolingInletNode,              !- Name
  Cooling Coil Air Inlet Node,   !- Component Name or Node Name
  Other,                         !- Component Object Type or Node Type
  3.0;                           !- Node Height {m}

You've created a AirflowNetwork:Distribution:Node object named "Cooling Coil Air Outlet Node" instead of one that refers to the outlet node of the cooling coil. I'm not sure where the other error is coming in, but you're using the name "Mixed Air Node" for both an air loop node and an AFN node so the IDF is somewhat hard to follow. I'd try to change the names so things are clearer and the nodes are differentiated. I suspect something is getting confused there. If I get a chance to run your file, I'll update my answer.