Rebuild asset library database

Hello, I am opening a very old Unity project I had saved and I get the following error:

"Rebuilding Library because the asset database could not be found!"

But Unity is not doing anything and I cannot see anything in the project window. Can someone help me with rebuilding this library or being able to see the contents of the project?

Thanks.

Never mind, I think I was looking in the wrong folder, not the actual root Unity folder but one above it. Sorry about that :)

Please note that when you copy the Unity folders onto a Windows 10 PC, ALL the folder dates created change to the day you are copying - Unity looks for the date you created the Library folder and fails if the date is not the same.

@MikeTyke, Then How to solve the issue, I am getting the same issue too.