I had allot of 500 error issues as well. Fixed by enabeling modrewrite for apache and enabeling/allowing options to be set in htaccess. I now only have 2 issues (1 of which isnt really an issue ). 1. when pressing start it wont launch the minecraft server. (not sure whats causing this) 2. the plugin isn't working on my current server setup (but thats becasue it says for 440 or so and imusing 49- something becasue one of my own plugins needs it).