diff --git a/src/Application.hs b/src/Application.hs
index b8c636ef8..f8fedf4f4 100644
--- a/src/Application.hs
+++ b/src/Application.hs
@@ -145,6 +145,7 @@ import Handler.Participants
 import Handler.StorageKey
 import Handler.Error
 import Handler.Upload
+import Handler.Qualification
 import Handler.LMS
 
 -- This line actually creates our YesodDispatch instance. It is the second half
diff --git a/src/Jobs/Handler/LMS.hs b/src/Jobs/Handler/LMS.hs
index fff6a9d14..a3bf653fc 100644
--- a/src/Jobs/Handler/LMS.hs
+++ b/src/Jobs/Handler/LMS.hs
@@ -103,7 +103,7 @@ dispatchJobLmsDequeue _qid =
   -- wenn bestanden: qualification verlängern & LmsIdent löschen
   -- wenn durchgefallen: LmsIdent löschen
   -- wenn Zeit abgelaufen: LmsIdent löschen 
-  error "lms dequeue stub"
+  error "TODO: lms dequeue stub"
 
 dispatchJobLmsResults :: QualificationId -> JobHandler UniWorX
 dispatchJobLmsResults qid = JobHandlerAtomic act 
diff --git a/src/Jobs/Handler/SendNotification/Qualification.hs b/src/Jobs/Handler/SendNotification/Qualification.hs
index 10efb99c0..dfe145c8d 100644
--- a/src/Jobs/Handler/SendNotification/Qualification.hs
+++ b/src/Jobs/Handler/SendNotification/Qualification.hs
@@ -37,7 +37,7 @@ dispatchNotificationQualificationExpiry nQualification _nExpiry jRecipient = use
 
 dispatchNotificationQualificationRenewal :: QualificationId -> UserId -> Handler ()
 dispatchNotificationQualificationRenewal nQualification jRecipient = userMailT jRecipient $ do
-  (User{..}, Qualification{..}, Entity _ QualificationUser{..}) <- liftHandler . runDB $ (,,)
+  (User{}, Qualification{..}, Entity _ QualificationUser{}) <- liftHandler . runDB $ (,,)
     <$> getJust jRecipient
     <*> getJust nQualification
     <*> getJustBy (UniqueQualificationUser nQualification jRecipient)
@@ -46,6 +46,9 @@ dispatchNotificationQualificationRenewal nQualification jRecipient = userMailT j
   replaceMailHeader "Auto-Submitted" $ Just "auto-generated"
   setSubjectI $ MsgMailSubjectQualificationRenewal qname
   
-  -- editNotifications <- mkEditNotifications jRecipient -- TODO: add to hamlet file again
-  addHtmlMarkdownAlternatives $(i18nHamletFile "qualification/renewal")
+  _editNotifications <- mkEditNotifications jRecipient -- TODO: add to hamlet file again
+  --addHtmlMarkdownAlternatives $(i18nHamletFile "qualification/renewal")
+  -- TODO: this is just a dummy to continue while i18nHamletFile usage is unclear
+  error "TODO: QualificationRenewal notification no yet implemented"
+  -- addHtmlMarkdownAlternatives $(ihamletFile "templates/mail/qualificationExpiry.hamlet")
   
\ No newline at end of file
diff --git a/src/Model.hs b/src/Model.hs
index 9c572b67a..17d96d08c 100644
--- a/src/Model.hs
+++ b/src/Model.hs
@@ -49,7 +49,9 @@ deriving newtype instance FromJSONKey UserId
 deriving newtype instance ToJSONKey ExamOccurrenceId
 deriving newtype instance FromJSONKey ExamOccurrenceId
 
+-- required Show instances for use of getByJust 
 deriving instance Show (Unique ExamPart)
+deriving instance Show (Unique QualificationUser)
 
 -- ToMarkup and ToMessage instances for displaying selected database primary keys