diff --git a/server/core/convert_page_translation.py b/server/core/convert_page_translation.py
index 8c7fdb27..f530a2ee 100644
--- a/server/core/convert_page_translation.py
+++ b/server/core/convert_page_translation.py
@@ -29,11 +29,14 @@ def convert_page_to_translation(slug: str, original_slug: str, language_code="en
     """
     try:
         module = Module.objects.get(slug=slug)
-        original = Module.objects.get(slug=original_slug)
-        if original.translation_key == module.translation_key:
-            raise AlreadyTranslatedException
     except Module.DoesNotExist:
-        raise ModuleDoesNotExistException
+        raise ModuleDoesNotExistException(slug)
+    try:
+        original = Module.objects.get(slug=original_slug)
+    except Module.DoesNotExist:
+        raise ModuleDoesNotExistException(original_slug)
+    if original.translation_key == module.translation_key:
+        raise AlreadyTranslatedException
     locale, _ = Locale.objects.get_or_create(language_code=language_code)
     logger.debug("Starting conversion")
     topic: Topic = module.get_parent()
diff --git a/server/core/management/commands/migrate_translation.py b/server/core/management/commands/migrate_translation.py
index 0c8a6cd0..13d21b1b 100644
--- a/server/core/management/commands/migrate_translation.py
+++ b/server/core/management/commands/migrate_translation.py
@@ -35,7 +35,9 @@ class Command(BaseCommand):
                 slug=slug, original_slug=original_slug, language_code=language_code
             )
             self.stdout.write(result)
-        except ModuleDoesNotExistException:
-            raise CommandError("Module does not exist")
+        except ModuleDoesNotExistException as e:
+            raise CommandError(f"Module does not exist: {e}")
         except AlreadyTranslatedException:
-            raise CommandError("Pages already are translations of each other")
+            raise CommandError(
+                f"Pages {slug} and {original_slug} already are translations of each other"
+            )