YES! Thank you so much! That did it

Hey there,
I'm relatively new to sketchup plugins and am having issues with RoundCorner.
I have downloaded LibFredo6 and RoundCorner and placed the contents of both download folders into application support/google sketchup 8/sketchup/plugins.
The first time i opened sketchup after placing the downloaded files into sketchup/plugins an error message came up. It said something like 'cannot create folder DEFPARAM_Dir, do manually'. I then created this folder manually and re opened sketchup.
Everything seemed to be okay because the roundcorner toolbar had appeared. However, when i click on the little roundcorner icons to try to use the tool nothing happens. I've tried everything to make it work but the toolbar just seems to be 3 button which don't operate.
I've been going through files to see what may be causing it but can't find anything. The only thing is that the DEFPARAM_Dir folder i created manually has no files in it.
If anyone has any idea what's happening and can help me fix it, please do!
Thanks, Billy.