Please Help! My Lightroom App Won’t Open!!

Every time I click my Lightroom app on my Apple Mac Pro, it keeps saying

"adobe Lightroom quit unexpectedly. Click reopen to open application again. This report will be sent to apple automatically." 

It has now been two weeks, I've reopened a million times, I've restarted my computer multiple times, I've made sure my laptop is completely updated, and I've deleted the app and redownloaded it and it still is the same problem. 
I am a photographer and needs this fixed asap! Does anyone know what to do???