Changed error code

packages/app/src/server/routes/apiv3/installer.ts

@@ -52,7 +52,7 @@ module.exports = (crowi: Crowi): Router => {
     }
     catch (err) {
       if (err instanceof FailedToCreateAdminUserError) {
-        return res.apiv3Err(new ErrorV3(err.message, 'failed_to_install'));
+        return res.apiv3Err(new ErrorV3(err.message, 'failed_to_create_admin_user'));
       }
       return res.apiv3Err(new ErrorV3(err, 'failed_to_install'));
     }