Question Database error with new installation

Hi,

I've searched for quite a while for a solution and can't find one. My host isn't being much assistance either.
I'm trying to re-stall a website (using the .jpa file and Akeeba) but am getting this error when I try to reinstall:
No database definitions were found or no database was selected.
I have the correct db name, username and password (I've checked many times) and the user has all the appropriate permissions. I'm using 'localhost' which is correct (I checked with the host).
I have done this many times and have never had an issue.
Anyone have any idea what's happening and any potential solutions?

Please help.

I didn't find the right solution from the Internet.

References:-
forum.joomla.org/viewtopic.php?t=953732
Motion graphics animation agency

Thanks!