This seems to be a common error message; unfortunately, a lot of people have reported the same problem 🙁 As a workaround, I recommend uploading your story as a plain text (txt) or Word document (doc) attachment.
There may be something in the text that the filter is seeing as a web address or email address. Is there an @ symbol anywhere or a period followed by 2 or 3 letters? If you want you can email the text to me (address in sig) and I can look through it for you.
The rule was put in place to prevent people from creating accounts just to advertise their websites. It wasn't a huge problem anyway but a lot of people are getting this error because of it...We hope TT will soon change the rule.