You will receive this message if you run Credosity on a blank document in Word OR an empty new email in Outlook. It's Credosity telling you that there's nothing to analyse.
If you get this message when there is text then there's something wrong with your install OR your document properties are such that Credosity can't register the text. Credosity can't read and doesn't like Webdings, Wingdings, Symbols and the like. Any normal Office fonts will be fine. If you have a combination of normal Office fonts and Webdings/Wingdings/Symbols, etc., then Credosity will only analyse the normal fonts and ignore the funny ones. There are so many variations on the theme, and edge cases, that we haven't yet caught them all.
If this is happening for you please let us know. It's helpful if you share a screen shot of what happened, being sure to show in the screenshot the email or document text you're working on.
We may ask you to send your log files if we can't easily pinpoint what's happening.