It sounds like you're referring to our Facebook Advertising feature. I am sorry to hear you are getting this message. I would review the text that has been inserted to make sure there is no more than a single space between each word. Also, if the text was pasted in from another source (like a text document, another email, webpage, etc.) it's possible hidden formatting is being carried over. I would clear the field and type it out fresh to see if that fixes the issue.