Jay Reeve wrote: > It seems to have something to do with the plist. I created a new project, collected copies of all the appropriate files in it, and it ran fine. Afterwards, I noticed I had not included the plist, so I put a copy of it in the folder and the error returned. It was the one included with the FBShell project, edited to reflect my project name. In the Finder, Get Info on your built app. Look in <Foo.app>/Contents/MacOS/ for the executable. Its name must match exactly that specified in the Info.plist. > file://localhost/Applications/FutureBASIC/%20Studio%20Manager/Studio%20Mgr%20a12/%20Studio%20Mgr.app/. You have a space in front of the name " Studio Mgr.app". This is unusual, and may be related to your problem. Robert P.