--- a/hgext/journal.py	Mon Sep 03 07:52:24 2018 +0900
+++ b/hgext/journal.py	Mon Sep 03 07:53:50 2018 +0900
@@ -514,7 +514,7 @@
                     ctx = repo[hash]
                     displayer.show(ctx)
                 except error.RepoLookupError as e:
-                    fm.write('repolookuperror', "%s\n\n", pycompat.bytestr(e))
+                    fm.plain("%s\n\n" % pycompat.bytestr(e))
             displayer.close()
 
     fm.end()