500 server internal error in safari after install fbconnect

[khunoate2]

I installed prestashop version 1.4.x but I installed facebook connect module which not compatible with my version. i overwrite file customer.php, authentation.php and authentation.ptl

But i backuped it.

I found in Safari that show 500internal server for safari but IE,FF and chrome not find error but no module on firstpage.

Therefore I deleted module and upload backup file to my prestashop

But in safari I still found 500internal server error . Do I have to reinstall ?

Please advice i'm kinda new for prestashop .

[shacker]

go to preferences, performance and force compile to update the changes in TPL files