Upgrade PayPal v3.0.9 to PayPal USA, Canada v1.2.7 error message

[bgiguere]

Hello everyone, I'm starting to have problems with my PayPal payments.  So I looked into upgrading the module and came to a thread about installing the Backward Compatibility module (since I'm using Prestashop 1.4.9) and the PayPal USA, Canada v.1.2.7 module.  I uninstalled the v3.0.9 and enabled the new module.  Now when I click on configure, I get this error message : Fatal error: Call to a member function addCSS() on a non-object in /home/xxxx/public_html/modules/paypalusa/paypalusa.php on line 143.

 

Any ideas as to what I should do to fix this?

 

Thanks in advance for any help provided.