/usr/share/sawfish/lisp/error-handler.jl is in sawfish-lisp-source 1:1.11-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/sawfish/lisp/sawfish/wm/ext/error-handler.jl
/usr/share/sawfish/lisp/sawfish/wm/ext/error-handler.jl