C57 Add-on installation "Cannot redeclare class"
Wanted to start with c57 development, so I started a clean installation with beta 1. Then I copied an example add-on from http://andrewembler.com/posts/concrete5-57-add-on-development-part-... and put it in /packages.
If I go to Dashboard / Extend, I'm getting this error: "require(): Cannot redeclare class emaillistsignuppackage".
Is this a bug, or am I doing something wrong?