After upgrade from D6 "page not found" error

Each time when the homebox page is accessed this error appears: "Page not found: sites/all/libraries/tinymce/jscripts/tiny_mce/plugins/emotions/img/smiley-cool.gif"

In D6 this library was used. In D7 I switched to ckeditor and the above library does not exist anymore. Still the above error.

There is no block used in homebox that has a link to that smiley...

Apart from this Homebox works fine.

What can I do about this error?

Thanks,

Jippie.