I am getting rule error after rasa init command… I don’t know how to solve this… I am new to rasa, if anyone could guide me, it would be very helpful
(chatbot) D:\ML\My Projects\chatbot>rasa init
2021-03-20 19:26:57.459169: I tensorflow/stream_executor/platform/default/dso_loader.cc:48] Successfully opened dynamic library cudart64_101.dll
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Welcome to Rasa! 
To get started quickly, an initial project will be created.
If you need some help, check out the documentation at Introduction to Rasa Open Source.
Now let’s start! 
? Please enter a path where the project will be created [default: current directory]
? Directory ‘D:\ML\My Projects\chatbot’ is not empty. Continue? Yes
Created project directory at ‘D:\ML\My Projects\chatbot’.
Finished creating project structure.
? Do you want to train an initial model? 
Yes
Training an initial model…
Traceback (most recent call last):
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\runpy.py”, line 192, in _run_module_as_main
return run_code(code, main_globals, None,
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\runpy.py”, line 85, in run_code
exec(code, run_globals)
File "C:\Users\chinmay\anaconda3\envs\chatbot\Scripts\rasa.exe_main.py", line 7, in
File "c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa_main.py", line 116, in main
cmdline_arguments.func(cmdline_arguments)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\cli\scaffold.py”, line 234, in run
init_project(args, path)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\cli\scaffold.py”, line 129, in init_project
print_train_or_instructions(args, path)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\cli\scaffold.py”, line 68, in print_train_or_instructions
training_result = rasa.train(domain, config, training_files, output)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\train.py”, line 94, in train
return rasa.utils.common.run_in_loop(
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\utils\common.py”, line 307, in run_in_loop
result = loop.run_until_complete(f)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\asyncio\base_events.py”, line 608, in run_until_complete
return future.result()
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\train.py”, line 151, in train_async
file_importer = TrainingDataImporter.load_from_config(
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\shared\importers\importer.py”, line 84, in load_from_config
config = rasa.shared.utils.io.read_config_file(config_path)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\shared\utils\io.py”, line 560, in read_config_file
return read_validated_yaml(filename, CONFIG_SCHEMA_FILE)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\shared\utils\io.py”, line 544, in read_validated_yaml
rasa.shared.utils.validation.validate_yaml_schema(content, schema)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\rasa\shared\utils\validation.py”, line 170, in validate_yaml_schema
c.validate(raise_exception=True)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\core.py”, line 164, in validate
self._start_validate(self.source)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\core.py”, line 196, in _start_validate
r = Rule(schema=v)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\rule.py”, line 64, in init
self.init(schema, “”)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\rule.py”, line 428, in init
func_mapping[k](v, rule, path)
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\rule.py”, line 1145, in init_mapping_value
regex_rule.init(v, u"{0}/mapping;regex/{1}".format(path, regex[1:-1]))
File “c:\users\chinmay\anaconda3\envs\chatbot\lib\site-packages\pykwalify\rule.py”, line 438, in init
raise RuleError(
pykwalify.errors.RuleError: <RuleError: error code 4: Unknown key: nullable found: Path: ‘/mapping;regex/.+’>