The problem is redeclaring the autoload handler in Twilio file. Just update the file twilio/Services/Twilio.php
and when it says:
spl_autoload_register('Services_Twilio_autoload');
change it by
spl_autoload_register('Services_Twilio_autoload', false);
This way the function will omit messsages when the handler is recalled. You can also check if the handler was created prior to redeclare it. I hope it works!
Check documentation online at: http://php.net/manual/en/function.spl-autoload-register.php