I'm trying to use the Mac signing tool codesign to sign a processing generated app for distribution.  This is so that it will run on 10.8.x without generating Gatekeeper errors.

Here's what I'm typing into Terminal (where "Developer ID Application: My Name" is the name of my signing certificate and "ApplicationName.app" is the name of my app):

1. codesign -f -s "Developer ID Application: My Name" "ApplicationName.app"

Here's the error message I get:

1. ApplicationName.app: replacing existing signature
2. ApplicationName.app: cannot find code object on disk

I've spent most of the day googling & none of the solutions I've found has helped.  I've tried running:

1. export CODESIGN_ALLOCATE="/Developer/Platforms/MacOSX.platform/Developer/usr/bin/codesign_allocate"

and

1. export CODESIGN_ALLOCATE="/Applications/Xcode.app/Contents/Developer/usr/bin/codesign_allocate"

and

1. ln -s /usr/bin/codesign_allocate /Applications/Xcode.app/Contents/Developer/usr/bin/codesign_allocate

before signing to no avail.  (Solutions recommended by other developers on various forums.)

Any help or pointers would be most appreciated!  Thanks!