Installing WordPress using cpAddons – You do not have sufficient permissions to access this page.

I have a problem today using cpAddons to install my WordPress into one of my subdirectory. I receive "You do not have sufficient permissions to access this page." error upon logging into my WordPress panel. I believe this is not the first time i encounter this problem but this problem only appear if you are not using the default database "wp" as suggested by cpAddons. I google around for a while but didn't get the answer i want or any valuable solution. Hence, i debugged it myself.