It is because you shouldn't of updated to 6.14. LR 6.14 does not run on the version of OS X that is installed on your Mac.
** Lightroom CC 2015.1/Lightroom 6.1 and earlier versions are supported on Mac OS X v10.8. Lightroom CC 2015.6.1/Lightroom 6.6.1 and earlier are supported on Mac OS X v10.9. Lightroom CC 2015.6.12/Lightroom 6.12 and earlier are supported on Mac OS X v10.10.
Lightroom Classic CC system requirements
The last version that works on OS X 10.9.x is LR 6.6.1
You will need to Uninstall LR. Then go to the link below and download both the Base installed, it's at the top, and the 6.6.1 update.
Install the base program then update it to 6.6.1. Then NEVER Check for updates again.
Or you can upgrade OS X to a never version if your Mac supports it.
Download Photoshop Lightroom