how to debug .emacs?

I finally managed to build and install XEmacs 21.2.13 but starting up xemacs gives me the "internal input stream" error in the window. I still can edit but would like to fix the problem. The lisp stack trace, when run with -debug-init is as followings. What could cause this error? Running xemacs with -q doesn't show any error so the problem must be in my .emacs. I'd like to know if there is any easy way to locate the offending line. Signaling: (end-of-file "internal input stream") load-internal("~/.emacs" t t t undecided) load("~/.emacs" t t t) load-user-init-file("") load-init-file() command-line() normal-top-level() -kuro