I use Subversion for control of my own source code.
When I get a local working copy, Subversion drops a hidden folder (.svn) in the folder as well.
Using the Spark Dev IDE I get “app code was invalid” when I compile. If I delete the .svn folder then I can compile fine.
In my Spark Dev preferences I have Exclude VCS Ignored Paths checked and .svn is in the Ignored Names list.
I’m running 0.0.20