UnicodeEncodeError: 'charmap' codec can't encode character '\u21b5' in position 145: character maps to

Question

running this code ends up with the error, but I don't have any clue:

   *** Settings ***
# https://robotframework-browser.org/
Library   Browser

*** Test Cases ***
Example Test 23292
    Browser.OPEN BROWSER  https://obstaclecourse.tricentis.com/Obstacles/23292
    # https://marketsquare.github.io/robotframework-browser/Browser.html#Drag%20And%20Drop
    ${regel}=  Get Element      xpath=//*[contains(text(),'Write recipe')]
    DRAG AND DROP    ${regel}       id=completed-tasks
    sleep  3s
    DRAG AND DROP    xpath=//*[contains(text(),'1')]    id=completed-tasks
    sleep  3s
    DRAG AND DROP    xpath=//*[contains(text(),'2')]    id=completed-tasks
    sleep  3s