Text encoding for your Project CSV file needs to be UTF-8. This is typically the default choice for most spreadsheet programs — but not always. If you're prompted to select a format when using your spreadsheet program, be sure it's UTF-8.
If you receive this error, check your spreadsheet program and ensure that the text encoding for CSV files is set to UTF-8 and try again. Incorrect CSV file formatting will also cause some fonts and/or special characters to not display properly in Snapizzi.
If you continue to have problems, try copying and pasting the contents into a new spreadsheet. If that doesn't resolve it, try using Google Sheets and saving as a CSV to your desktop.