Select multiple from file option is giving an error message

Please how do I rectify this error message while trying to preview my form after creating a question with the “Select multiple from file” option

Welcome to the community, @debby_7! You may need to go through this support article Select One or Many From External File Question Type to solve your issue. Based on your screenshot, it seems that you did not specify the extension of your file when using it with the question type select_one_from_file or select_multiple_from_file. It should be in this format: