Outlook won’t open, splash screen comes up briefly and then disappears again and the program quits

I ran the most recent outlook update and now my outlook won't open. The splash screen comes up and I can see the program running at the top of my mac air and when I go to force quit, it is running,  but it does not open up. 

I have tried  to rebuild the main identity and receive an error  ~18000, so it won't rebuild. I tried the terminal processes defaults delete.com.microsoft.Outlook and killall cgprefsd, which did not work etiher. Does anyone have any other suggestions please. I HAVE to get my emails back!!! Thank you