fixing error messages

libdaggy/src/Serialization.cpp

@@ -357,7 +357,7 @@ namespace daggy {
       throw std::runtime_error("Payload is not a dictionary.");
     }
     if (!spec.HasMember("tag")) {
-      throw std::runtime_error("DAG Run is missing a name.");
+      throw std::runtime_error("DAG Run is missing a tag.");
     }
     if (!spec.HasMember("tasks")) {
       throw std::runtime_error("DAG Run has no tasks.");