Can't find XML / Simple.pm in @INC after installation

When I run my perl script I keep getting this error: Can't locate XML/Simple.pm in @INC after install

I have installed a bunch of modules including Bundle::CPANxxl

from CPAN.

The first time I started / installed CPAN, I ran it as root:

$ sudo cpan

      

        
        
        
      

    

Then again:

$ sudo cpan
cpan> install Bundle::CPANxxl
cpan> install Xml::Simple

      

        
        
        
      

    

When I run my Perl script I still get the error Can't locate XML/Simple.pm in @INC...

in Apache "error.log"

I am running the following with and without root:

cpan> install XML::Simple
cpan> upgrade
cpan> realod cpa

      

        
        
        
      

    

Why am I getting this error all the time even though I have installed the module multiple times? Can I get some advice on this issue?