I am new to write texinfo. I am getting an error like this:

joke.texi:9470: Node `New Utilities' previously defined at line 8867.
/Users/Shared/sources/lisp/joke//joke.texi:9666: Prev field of node `Example Bezier Curves' not pointed to.
/Users/Shared/sources/lisp/joke//joke.texi:8867: This node (New Utilities) has the bad Next.
makeinfo: Removing output file `joke-texi.html' due to errors; use --force to preserve.
make: *** [joke-texi.html] Error 1