Help needed. Yesterday when I restarted my Macbook I could not open outlook. It will blink and then disappear. I tried to rebuild the main identity after closing all applications but it said "Your database cannot be rebuilt - 18000".

I tried to create a new identity and copy selected folders from Main identity inside it but still after that it could not rebuild this identity and same error appears"Your database cannot be rebuilt - 18000".. I can see the folder inside main identity which has my email messages but I cannot open because it is not connected to my New identity which I have created