Installation Of Tcpdf Issue "include(Tcpdf.php): Failed To Open Stream..."

i’m trying to install tcpdf and i follow line by line this tutorial:

unfortunately when i try to access the action CreatePdf yii crash because it cannot include the tcpdf.php file.

i’ve already tried this solution:




but nothing change.

my suspect is that there are uncompatibility due to upper and lower case, but it’s just a theory… any idea?