raise PydanticInvalidForJsonSchema(f'Cannot generate a JsonSchema for {error_info}')
pydantic.errors.PydanticInvalidForJsonSchema: Cannot generate a JsonSchema for core_schema.PlainValidatorFunctionSchema ({'type': 'no-info', 'function': <function import_string at 0x105a2c360>})
last error in stack trace upon visiting http://127.0.0.1:8000/docs (which gives 500 error):