Lightroom crashes when opening “Preferences” or selecting B&W

Good Evening all,

This is what I get whenever I try to open preferences or change a photo to Black and White. Hope someone can help me out

Thanks

Craig

Process:               Adobe Lightroom [1484]

Path:                  /Applications/Adobe Lightroom/Adobe Lightroom.app/Contents/MacOS/Adobe Lightroom

Identifier:            com.adobe.Lightroom6

Version:               Adobe Lightroom [1099473] (6.8)

Code Type:             X86-64 (Native)

Parent Process:        ??? [1]

Responsible:           Adobe Lightroom [1484]

User ID:               501

Date/Time:             2017-02-06 17:51:27.333 -0500

OS Version:            Mac OS X 10.11.6 (15G1217)

Report Version:        11

Anonymous UUID:        757F6746-5A45-4D31-8521-7872E0C150DD

Time Awake Since Boot: 2300 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)

Exception Codes:       0x0000000000000000, 0x0000000000000000

Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:

Performing @selector(showPreferences:) from sender NSMenuItem 0x7fdc227b9a70

terminating with uncaught exception of type dng_exception

abort() called