This article will be related to troubleshooting. Today, I managed somehow to write a comment that caused the entire instance to crash due to a UnicodeDecodeError. How did I manage to do that? UnicodeDecodeError: ‘charmap’ codec can’t decode byte failed to decode a specific character “ň,” which is specific to the Czech Republic. I’m not sure if this can happen with other character sets, but I’ll provide as much information as possible so that you can potentially catch this error.

The error occurred because I wrote a comment in Python code “# Přesuňte se do cílového adresáře s modelem” (Czech) When attempting to start, an error occurs as shown below, and the instance fails to startUnicodeDecodeError: ‘charmap’ codec can’t decode byte 0x88 in position 554: character maps to <undefined>

Environment in Which the Error Occurred

The environments in which this occurred are as follows:


I tested the error in five different environments:

  • iOS Docker – OK
  • iOS pip – OK
  • Windows natively – Error
  • Windows via Parallels with a custom instance – Error
  • Windows via Parallels connected to a instance running on iOS – OK (ip/6789)

Browsers Safari and Chrome – regardless of the environment.

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Ing. Jan Zedníček - Data Engineer & Controlling

My name is Jan Zedníček and I have been working as a freelancer for many companies for more than 10 years. I used to work as a financial controller, analyst and manager at many different companies in field of banking and manufacturing. When I am not at work, I like playing volleyball, chess, doing a workout in the gym.

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