Can’t verify SSL peers

I have been running a script which uses a Google docs spreadsheet to update the webpage daily. Every day that Google updates, my data disappears and I have to re-upload the text file again. This script has been working fine for 2 years. The text file gets replaced with the following error message:

File does not exist: Can’t verify SSL peers without knowning which Certificate Authorities to trust
This problem can be fixed by either setting the PERL_LWP_SSL_CA_FILE envirionment variable or by installing the Mozilla::CA module.
To disable verification of SSL peers set the PERL_LWP_SSL_VERIFY_HOSTNAME envirionment variable to 0.  If you do this you can’t be sure that you communicate with the expected peer.

I sent an email to the author of the script and he says it is not his script which is at fault and pointed me to this page: http://sysops.ie/blog/2011/03/21/cant-verify-ssl-peers-without-knowning-which-certificate-authorities-to-trust/

I am none the wiser. I don't understand what I am supposed to do. I downloaded the file but then what? Can you please step me through this. I am sure it is easy if you know what you're doing!