configparser.MissingSectionHeaderError: File contains no section headers.

[m-primo]

Traceback (most recent call last):
  File "app.py", line 220, in <module>
    main()
  File "app.py", line 204, in main
    login_from_config()
  File "app.py", line 191, in login_from_config
    fb_login(get_config(configPath))
  File "app.py", line 186, in get_config
    configObj.read(configPath)
  File "D:\Software\Program Files\Python\lib\configparser.py", line 697, in read
    self._read(fp, filename)
  File "D:\Software\Program Files\Python\lib\configparser.py", line 1082, in _read
    raise MissingSectionHeaderError(fpname, lineno, line)
configparser.MissingSectionHeaderError: File contains no section headers.
file: 'config.txt', line: 1
'\ufeff[credentials]\n

This error will happen if config.txt file encoding is not UTF-8, maybe will happen if the encoding is UTF-8 BOM.
So, all you have to do is to change the encoding of the file to UTF-8.

Hint: you can change the encoding with Notepad++, Sublime Text, or any other text editor allows you that.