upload_path has to be relative

config.json.template

@@ -9,9 +9,6 @@
         "username": "##MONGODB_USERNAME",
         "password": "##MONGODB_PASSWORD",
         "database": "##MONGODB_DATABASE"
-    },
-
-    "upload_path": "/app/data/public/uploads",
-    "views_dir": "/run/nodebb/public/templates"
+    }
 }