What happened when I changed directories?

[Yves S. G. <you...@gm...>]

Hi guys.  I changed directories in clisp with (ext:cd "path/to/file") and
got this... could some please explain why I got this error and how could I
avoid it?

http://bin.cakephp.org/view/209161709

The command on line 7 shows that I got to the desired location, so the path
is valid (I suspected that I had fat-fingered the path and hence the error,
until I found out it switched correctly).