Questions about "no window found" error

[Kun Niu]

Dear freebsd users,

I've got such a strange question.
I can start my xwindow.
But each time I use mozilla bundled with my 5.3 release.
I found the error "no window found error"
It also strange that I can start x, but I can't get startkde run.
I really installed kde on my computer.
Can anyone give any hints?

Any help woud be appreciated.

Thanks in advance.