it says library is currently empty

I have mac air. I used to have kodi on the same mac till yesterday. I did messed it up while i was creating my favorites . Some how i did something wrong and It did not play the movies or any anything else on the Kodi. so i uninstalled it and reinstalled after that happened for several times. it gives me the same screen again and again. There is no fresh start unfortunately. It is not the starting screen that i had before. there are files but nothing else. i tried to add links on to the add ons but it does not work . It says your library currently is empty . it has been hours that i have been trying to fix this thing. i am not sure what is wrong.

could someone help me please . I am so annoyed by this.