Thanks you all for answering!!! I've added that line $chart->output('/home/diffredential/Desktop/expression.png'); and nothing happened. The strace command gave a lot of complicated output to check anything for me! I downloaded the CPAN module some days ago, but I coudn't figure out how to use it having the Email::Send::Gmail tar gz file. I run in the interactive module "install Emaill...tar.gz" and start doing something but crashed at some point. Wow can't understand why it works to some of you and not for me :(