Fatal error: Call to undefined function dsm() in (...) views_bookmark.module on line 922

Hello,

Your module sounds great!!! But... I get this:

Fatal error: Call to undefined function dsm() in localhost:\iDoc2d6\drupal\modules\views_bookmark\views_bookmark.module on line 922

I run Drupal localy on a Win XP SP2 with easyphp v.2.0a4 (and many php extensions).
^{You can see my specs in the screenshot easyphp2config.gif.}

Can it come from my config file with the Apache, PHP or MySql directories? Else let me know... there doesn't seem to exist any true equivalent to what you propose.

Therefore any answer is welcome!