Yiiexcel Gives A Class Not Found Error

Hi there!

I’m trying to use the “YiiExcel” extension (http://www.yiiframework.com/extension/yiiexcel/) in my webpage but I’m unable to make it work… I’ve followed the instructions that appear in the page, I’ve downloaded and copied both “yiiexcel”, “phpexcel”… However, when I try to simply acces my index page, the page appears blank and the PHP error log show the following line:

PHP Fatal error:  Class 'PHPExcel_Shared_ZipStreamWrapper' not found in /Applications/MAMP/htdocs/prova2/index.php on line 22

I’ve searched over some forums (including this one) and I’ve found some possible solutions; however, none of them solves my problem, the same error always persists… Do you know if I’m missing something or doing something wrong?

Thanks in advance for your time and effort! :)