'How write logs to file with unicorn config

Its my uvicorn log_config.yaml. All works perfect untill i add logging to file. Its says to me

ValueError: not enough values to unpack (expected 5, got 0)

I try different variations of logging (FileHandler,RotateHandler) but same issue raised.

version: 1
disable_existing_loggers: False
formatters:
  default:
    "()": uvicorn.logging.DefaultFormatter
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
  access:
    "()": uvicorn.logging.AccessFormatter
    format: "[%(asctime)s %(process)d:%(threadName)s] %(name)s - %(levelname)s - %(message)s | %(filename)s:%(lineno)d"
handlers:
  default:
    formatter: default
    class: logging.StreamHandler
    stream: ext://sys.stderr

  access:
    formatter: access
    class: logging.StreamHandler
    stream: ext://sys.stdout
    
  file_handler:
    class: logging.FileHandler
    level: INFO
    formatter: access
    filename: info.log
    encoding: utf8
    mode: a

loggers:
  uvicorn.error:
    level: INFO
    handlers: [default]
    propagate: no

  uvicorn.access:
    level: INFO
    handlers: [access]
    propagate: no

Solution 1:^[1]

Since you specified all information about formatter in the yaml file you have no formatter object.

The python class for logging.FileHandler does not have an argument called formatter and thus custom formats cannot be used.

https://docs.python.org/3/library/logging.handlers.html#logging.FileHandler

Saying this, you can use the formatter: default as it's registered being the DefaultFormatter

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'How write logs to file with unicorn config

Solution 1:[1]

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Solution 1:^[1]