When testing on my local server, I got two database related errors.

1. My mysql password was blank, so the password array variable was not written at all to the configuration file.
SOL:I manually entered the variable into the config file.

2. The encoding/collation automatically added to the config file didnt work.
SOL : I dont know much about this, but I just deleted that line and vanilla started working.

I could do it because I was slightly experienced but I felt people who are not so good in this might get frustrated and dislike vanilla altogether which is bad for a great script. So, this loopholes should be taken care of.