Traceback (most recent call last):


 "<input>", line 1, in <module>


 "mtrand.pyx", line 1162, in mtrand.RandomState.choice


 "mtrand.pyx", line 994, in mtrand.RandomState.randint


 "mtrand.pyx", line 995, in mtrand.RandomState.randint


 "randint_helpers.pxi", line 253, in mtrand._rand_int64
ValueError: negative dimensions are not allowed

Traceback (most recent call last):


 "<input>", line 1, in <module>


 "/Users/.../lib/python3.6/site-packages/pydantic/main.py", line 292, in schema

s = model_schema(cls, by_alias=by_alias)


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 193, in model_schema

model, by_alias=by_alias, model_name_map=model_name_map, ref_prefix=ref_prefix


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 463, in model_process_schema

model, by_alias=by_alias, model_name_map=model_name_map, ref_prefix=ref_prefix


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 484, in model_type_schema

f, by_alias=by_alias, model_name_map=model_name_map, ref_prefix=ref_prefix


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 240, in field_schema

ref_prefix=ref_prefix,


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 442, in field_type_schema

ref_prefix=ref_prefix,


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 610, in field_singleton_schema

ref_prefix=ref_prefix,


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 534, in field_singleton_sub_fields_schema

ref_prefix=ref_prefix,


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 442, in field_type_schema

ref_prefix=ref_prefix,


 "/Users/.../lib/python3.6/site-packages/pydantic/schema.py", line 645, in field_singleton_schema

raise ValueError(f'Value not declarable with JSON Schema, field: {field}')
ValueError: Value not declarable with JSON Schema, field: field_NoneType type=NoneType required
