The only other way that I can think of a type 13 error would occur is if you've got anything other than a space after your footnote number in the footnote text.

For example:
1 adhidnads in asdifnidsfn

Will work well but:
1] asdnin idsne i sdf
or
1A. Schwarzenegger asdinvie dinsve
will create a type 13 error.

The macro does provide for ways of removing standard formatting (such as going from [1] -> 1) but my pdf conversion isn't consistent about spacing so I've had a situation where the space after the footnote number disappeared and it threw everything off. Might that be what's happening to you?