Unable to run on Ubuntu 20

[caiwan]

I am unable to run the application on Ubuntu 20. I followed the instruction in the readme which instructed me to just execute play.sh. After microconda had pulled all the dependencies, aiserver.py was unable to start up and thew an exception as follows:

$ . play.sh 
Traceback (most recent call last):
  File "aiserver.py", line 7726, in <module>
    def get_version():
  File "aiserver.py", line 625, in new_decorator
    self.path(view=g, **kwargs)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/core.py", line 516, in path
    plugin.operation_helper(path=path, operations=operations, **kwargs)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/__init__.py", line 218, in operation_helper
    self.resolver.resolve_operations(operations)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/schema_resolver.py", line 34, in resolve_operations
    self.resolve_response(response)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/schema_resolver.py", line 182, in resolve_response
    self.resolve_schema(response)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/schema_resolver.py", line 230, in resolve_schema
    content["schema"] = self.resolve_schema_dict(content["schema"])
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/schema_resolver.py", line 294, in resolve_schema_dict
    return self.converter.resolve_nested_schema(schema)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/openapi.py", line 101, in resolve_nested_schema
    self.spec.components.schema(name, schema=schema)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/core.py", line 167, in schema
    ret.update(plugin.schema_helper(component_id, ret, **kwargs) or {})
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/__init__.py", line 176, in schema_helper
    json_schema = self.converter.schema2jsonschema(schema_instance)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/openapi.py", line 197, in schema2jsonschema
    jsonschema = self.fields2jsonschema(fields, partial=partial)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/openapi.py", line 222, in fields2jsonschema
    prop = self.field2property(field_obj)
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/field_converter.py", line 176, in field2property
    ret.update(attr_func(field, ret=ret))
  File "/home/user/KoboldAI-Client/runtime/envs/koboldai/lib/python3.8/site-packages/apispec/ext/marshmallow/field_converter.py", line 227, in field2default
    default = field.load_default
AttributeError: 'Nested' object has no attribute 'load_default'

I have tried it on main and on tags/1.19.2 but yielded the same result.