Photos was unable to open the library “Photos Library.photoslibrary”. (3142)

I am a new user to Mac. I was trying to place the "Photos Library.photoslibrary" in the finder. However, I wasn't satisfied by just seeing it under the Picture Folder. I wanted the photos in it to be seen. I was thinking that maybe putting it to the trash, it will go back to how it is. But later did I realize I was deleting it so I immediately cancelled moving it to trash. But I wasn't able to open it anymore even though I cancelled moving it. How do you resolve this? By the way, I haven't emptied my trash and I don't have any backup