# Training Core - Failed to find a reader class for the story file \`data\` **URL:** \ **Category:** Rasa Open Source\ **Created:** [August 3, 2021, 3:50pm UTC](https://forum.rasa.com/t/training-core-failed-to-find-a-reader-class-for-the-story-file-data/46489 "2021-08-03T15:50:04Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![lamxw2](https://avatars.discourse-cdn.com/v4/letter/l/f14d63/32.png) [@lamxw2](https://forum.rasa.com/u/lamxw2)\ **Post date:** [August 3, 2021, 3:50pm UTC](https://forum.rasa.com/t/training-core-failed-to-find-a-reader-class-for-the-story-file-data/46489/1 "2021-08-03T15:50:04Z")
Hi, I had previously posted [Running the Test Command with Multiple Domain Files](http://forum.rasa.com/t/running-the-test-command-with-multiple-domain-files/46412) regarding testing with multiple domain files. I combined my domain files into a single domain file and “rasa test nlu” worked. However, I am still facing the same error message for “rasa train core” with a single domain.yml file. I was following the documentation on Comparing Policy Configurations [Testing Your Assistant](https://rasa.com/docs/rasa/testing-your-assistant#comparing-policy-configurations). “rasa train” itself works fine with no issues. This is the full stack trace (omitting the file path): ``` Traceback (most recent call last): File "/omitted/env/bin/rasa", line 8, in sys.exit(main()) File "/omitted/env/lib/python3.8/site-packages/rasa/ __main__.py", line 117, in main cmdline_arguments.func(cmdline_arguments) File "/omitted/env/lib/python3.8/site-packages/rasa/cli/train.py", line 165, in run_core_training rasa.utils.common.run_in_loop( File "/omitted/env/lib/python3.8/site-packages/rasa/utils/common.py", line 296, in run_in_loop result = loop.run_until_complete(f) File "uvloop/loop.pyx", line 1456, in uvloop.loop.Loop.run_until_complete File "/omitted/env/lib/python3.8/site-packages/rasa/core/train.py", line 147, in do_compare_training _, no_stories = await asyncio.gather( File "/omitted/env/lib/python3.8/site-packages/rasa/core/train.py", line 138, in get_no_of_stories stories = await loading.load_data_from_files([story_file], Domain.load(domain)) File "/omitted/env/lib/python3.8/site-packages/rasa/shared/core/training_data/loading.py", line 111, in load_data_from_files reader = _get_reader(story_file, domain, template_variables, use_e2e) File "/omitted/env/lib/python3.8/site-packages/rasa/shared/core/training_data/loading.py", line 35, in _get_reader return _guess_reader(filename, domain, template_variables, use_e2e) File "/omitted/env/lib/python3.8/site-packages/rasa/shared/core/training_data/loading.py", line 48, in _guess_reader raise ValueError( ValueError: Failed to find a reader class for the story file `data`. Supported formats are .md, .yml, .yaml. ``` ---
**Author:** ![ChrisRahme](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/chrisrahme/32/15572_2.png) [@ChrisRahme](https://forum.rasa.com/u/ChrisRahme)\ **Post date:** [August 3, 2021, 4:07pm UTC](https://forum.rasa.com/t/training-core-failed-to-find-a-reader-class-for-the-story-file-data/46489/2 "2021-08-03T16:07:19Z")
Can you show us the output of the `rasa --version` and `tree /f` commands in the root directory of the chatbot? ---
**Author:** ![lamxw2](https://avatars.discourse-cdn.com/v4/letter/l/f14d63/32.png) [@lamxw2](https://forum.rasa.com/u/lamxw2)\ **Post date:** [August 3, 2021, 4:29pm UTC](https://forum.rasa.com/t/training-core-failed-to-find-a-reader-class-for-the-story-file-data/46489/3 "2021-08-03T16:29:55Z")
Rasa --version ``` rasa --version Rasa Version : 2.7.1 Minimum Compatible Version: 2.6.0 Rasa SDK Version : 2.7.0 Rasa X Version : 0.41.1 Python Version : 3.8.3 ``` tree -f ``` ├── ./actions │ ├── ./actions/actions.py │ ├── ./actions/ __init__.py │ ├── ./actions/ __pycache__ │ │ ├── ./actions/ __pycache__ /actions.cpython-38.pyc │ │ └── ./actions/ __pycache__ / __init__.cpython-38.pyc │ └── ./actions/requirements-actions.txt ├── ./config_roberta.yml ├── ./config_spacy.yml ├── ./config.yml ├── ./credentials.yml ├── ./data │ ├── ./data/cuisine.yml │ ├── ./data/dairy.yml │ ├── ./data/datasets │ │ ├── ./data/datasets/dairy_dataset.pkl │ │ ├── ./data/datasets/fruit_dataset.pkl │ │ ├── ./data/datasets/grains_dataset.pkl │ │ ├── ./data/datasets/proteins_dataset.pkl │ │ ├── ./data/datasets/recipes_dataset.pkl │ │ └── ./data/datasets/veg_dataset.pkl │ ├── ./data/dish_categories.yml │ ├── ./data/fruits.yml │ ├── ./data/grains.yml │ ├── ./data/nlu_healthy_eating.yml │ ├── ./data/nlu.yml │ ├── ./data/proteins.yml │ ├── ./data/rules.yml │ ├── ./data/stories.yml │ └── ./data/vegetables.yml ├── ./docker-compose.yml ├── ./Dockerfile ├── ./domain │ └── ./domain/domain_healthy_eating.yml ├── ./domain.yml ├── ./endpoints.yml ├── ./events.db ├── ./events.db-shm ├── ./events.db-wal ├── ./models │ ├── ./models/20210728-223717.tar.gz │ ├── ./models/20210731-222535.tar.gz │ ├── ./models/20210801-000419.tar.gz │ ├── ./models/20210801-003539.tar.gz │ ├── ./models/20210801-012016.tar.gz │ ├── ./models/20210801-212804.tar.gz │ ├── ./models/20210801-230304.tar.gz │ ├── ./models/20210801-231817.tar.gz │ ├── ./models/20210802-030644.tar.gz │ ├── ./models/20210803-022937.tar.gz │ ├── ./models/20210803-024614.tar.gz │ ├── ./models/20210803-031802.tar.gz │ ├── ./models/20210803-034655.tar.gz │ ├── ./models/20210803-040204.tar.gz │ ├── ./models/20210803-042745.tar.gz │ ├── ./models/20210803-145147.tar.gz │ ├── ./models/20210803-150849.tar.gz │ ├── ./models/core-20210628-014507.tar.gz │ ├── ./models/core-20210628-014944.tar.gz │ ├── ./models/nlu-20210628-012100.tar.gz │ ├── ./models/nlu-20210628-012352.tar.gz │ ├── ./models/nlu-20210628-205142.tar.gz │ ├── ./models/nlu-20210701-191556.tar.gz │ └── ./models/nlu-20210802-030230.tar.gz ├── ./new │ ├── ./new/actions (with choose recipes).py │ ├── ./new/nlu (with recipes).yml │ ├── ./new/stories_recipes.yml │ └── ./new/stories (with recipe choice).yml ├── ./old │ ├── ./old/config_2.yml │ ├── ./old/config_xlnet.yml │ ├── ./old/domain_food_safety.yml │ ├── ./old/domain_healthy_eating (copy).yml │ ├── ./old/domain.yml │ ├── ./old/nlu (copy).yml │ ├── ./old/nlu_food_safety.yml │ ├── ./old/nlu_healthy_eating (copy).yml │ ├── ./old/nlu_old.yml │ ├── ./old/stories_old.yml │ └── ./old/stories.yml ├── ./preprocess_data │ ├── ./preprocess_data/cuisine │ │ ├── ./preprocess_data/cuisine/cuisine_dataset.pkl │ │ ├── ./preprocess_data/cuisine/cuisine.ipynb │ │ ├── ./preprocess_data/cuisine/DOHMH_New_York_City_Restaurant_Inspection_Results.csv │ │ ├── ./preprocess_data/cuisine/Restaurant_Inspection_Open_Data_Dictionary_082214.xlsx │ │ ├── ./preprocess_data/cuisine/test.json │ │ └── ./preprocess_data/cuisine/train.json │ ├── ./preprocess_data/food_list.ipynb │ └── ./preprocess_data/recipes │ ├── ./preprocess_data/recipes/dish_categories.txt │ ├── ./preprocess_data/recipes/epi_r.csv │ ├── ./preprocess_data/recipes/full_format_recipes.json │ ├── ./preprocess_data/recipes/recipe.py │ ├── ./preprocess_data/recipes/recipes.ipynb │ └── ./preprocess_data/recipes/utils.py ├── ./rasa.db ├── ./README.md ├── ./requirements.txt ├── ./story_graph.dot ├── ./temp │ ├── ./temp/testing_dataset_v1.json │ └── ./temp/training_dataset_v1.json ├── ./test.ipynb ├── ./tests │ └── ./tests/test_stories.yml └── ./train_test_split ├── ./train_test_split/nlg_test_data.yml ├── ./train_test_split/nlg_training_data.yml ├── ./train_test_split/test_data.yml └── ./train_test_split/training_data.yml ```