I created lib folder in my local project directory and downloaded Simple.pm from CPAN

That sounds like you just copied the module from CPAN and didn't install it using the proper tools. It's possible to get that to work, but it's usually harder than just using the "cpan" or "ppm" command line tools. In this case, you need to create a directory called "Config" which contains Simple.pm.

Secondly, in the code you've shown, you haven't used the Config::Simple module. You need to add use Config::Simple; to your code.