Errors when test has unicode characters

[kivipe]

When I have unicode characters, I get error messages. Steps to reproduce:

*** Settings ***
Library                     RobotDebug

*** Test Cases ***
Unicode
    ${myvar}=    Set Variable   こんにちは

[ ERROR ] Calling method 'start_keyword' of listener 'Listener' failed: UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 117: character maps to <undefined>