change wording of error

cmd/root.go

@@ -111,7 +111,7 @@ func orderedAdjMatrix(g igraph.WeightedGraph) (*mat.Dense, error) {
 		var ok bool
 		newOrder[node.ID()], ok = nodeIndexes[id]
 		if !ok {
-			return nil, errors.New("node '" + id + "' not in given order")
+			return nil, errors.New("node '" + id + "' not found in given order")
 		}
 	}