It is not a bug. This is an absolute error. There would be no other suggestion I can give here. Your installer has not inputted the correct database information.
You need to make sure the database hostname database name user and password are all correct.
To double check yourself you can actually run through the install again into the same database and table prefix and see if that sorts your issue.
I am not permitted to actually go in and install our application unless you purchase an install.