The subject line says it all – I assume \thefootnote{} is internally defined so this error seems strange.
I lifted the command from here: http://latex.silmaril.ie/formattinginformation/footnotes.html. Note, the command is missing a }, which I added. The result is as expected — symbols instead of numbers — but what about the compiler error?
BTW, I want to switch the indexing so that I can use footnotes and endnotes together without getting the indexing mixed up.
Best Answer
The suggested code is wrong:
should be (the second line below is just to show the proper position of the missing brace)
and not
as you did.