Export cover producing syntax error

I'm sure this used to work, but I can't work out what I'm doing wrong!

An action containing....
Export cover to file
I:\Documents\Colin's Docs\My Music\CD cover scans\TEMP\temp

...wrongly produces a jpg in the dir containing the music files the action's being run on, and that jpg is entitled "[ SYNTAX ERROR IN FORMATTING STRING ]"

Can't see what I'm doing wrong! mp3tag 2.44e

By the way, that's a valid file path and isn't set read-only or anything like that.

Colin's must be Colin''s

there you go - my previous path didn't have any punctuation in it. Thanks!