You have used the special character # where you shouldn't
have. Recall from §4.3. Special Characters and Symbols that if you want a # sign to appear you need
to do \# not just #.
This error message will be caused by doing, say,
"Dickimaw", "Dickimaw Books" and the Dickimaw parrot logo are
trademarks. The Dickimaw parrot was painted by Magdalene Pritchett.