Session Error CI3

Hi, I have a problem with session that I don't know why this happen.

This is the error-

A PHP Error was encountered

/*********************************/
Severity: Warning
Message: unlink(/tmp/ci_session63dd0d31085bffc2cd626dce8f5fb2ff5b8e5dc2) [function.unlink]: Operation not permitted
Filename: drivers/Session_files_driver.php
Line Number: 354
Backtrace:
File: /home/classic/public_html/registro/application/controllers/Equipo.php
Line: 9
Function: library
File: /home/classic/public_html/registro/index.php
Line: 292
Function: require_once
/*********************************/

In the Line 9 in the Equipo.php controller I have this code:

$this->load->library(array('session','form_validation'));

Anybody can help to me to fix this, please.



Thank you!