[iZN]

You've to place that crashdetect.dll inside the plugins folder. Also place crashdetect in server.cfg
Note: crashdetect plugin must be place at the end of all of your plugins.

e.g. plugins sscanf streamer crashdetect

Also if you want the server to get crashed on first run (which will help you, not waiting for your server to get crashed)
Just add this in server.cfg:
die_on_error 1

After that you will know that which thing is crashing the server. If you don't get that log, post it at scripting help board.