Trouble with Folder Full of MP3s plugin

This plugin seems like it should be so easy. I install activate the plugin. I created a folder in my server called audio. I uploaded my MP3s. I go to widgets and place the plug in in my right toolbar and copy the path from the audio folder in my server into the box called "folder" and viola! Nothing. What am I doing wrong? The title shows up in the sidebar where I've placed it, but none of my MP3s are showing up. Help me please. -Liane