You must provide a valid name for the question. Question names can include up to 24 letters or numbers. They cannot begin with a number, and cannot include spaces or underscores.
Note: When you rename a question, any skip logic or list building logic (syntax instructions that you have typed) that reference the old question name are NOT modified, and thus may still refer to the old question name. You will need to review these areas and change the question name references in such cases.