Assuming you put the chrip.app in your Applications folder, try running the following commands:

xattr -c /Applications/CHIRP.app
xattr -c /Applications/CHIRP.app/Contents
codesign --force --deep --sign - /Applications/CHIRP.app

Need to run these from the command line (use Terminal) and you must have Xcode installed.

You'll need to run these every time you update the CHIRP app.