SQLite in memory problem

"Not working" is hard to debug. Please provide some errors, from display and/or logs, as well as some code that causes the error. Will get help quicker.

Edit: you might want to try to set hostname to ':memory:' and not database.

I open php files with navigator, where is the error log files? And it's showing nothing, entire page in blank...
The console return:
Failed to load resource: the server responded with a status of 500 (Internal Server Error)

And I tried with changing :memory: to hostname and return:
GET http://localhost/xxx/run_tests 500 (Internal Server Error)
Thanks!

In application/config/config.php set log_threshold to 4, then you can find log files in application/logs/ directory.

Also make sure that display_errors is turned on, and error_reporting is set to E_ALL.

Oh my God! Thank you very much! I can see the error log on browser!

PHP Code:

Fatal error: Uncaught exception 'PDOException' with message 'could not find driver' in /var/www/proyec/system/database/drivers/pdo/pdo_driver.php:114 Stack trace: #0 /var/www/proyec/system/database/drivers/pdo/pdo_driver.php(114): PDO->__construct(':memory:', '', '', Array) #1 /var/www/proyec/system/database/DB_driver.php(115): CI_DB_pdo_driver->db_pconnect() #2 /var/www/proyec/system/database/DB.php(148): CI_DB_driver->initialize() #3 /var/www/proyec/system/core/Loader.php(346): DB('', NULL) #4 /var/www/proyec/system/core/Loader.php(1171): CI_Loader->database() #5 /var/www/proyec/system/core/Loader.php(152): CI_Loader->_ci_autoloader() #6 /var/www/proyec/system/core/Controller.php(51): CI_Loader->initialize() #7 /var/www/proyec/application/controllers/welcome.php(23): CI_Controller->__construct() #8 /var/www/proyec/system/core/CodeIgniter.php(308): Welcome->__construct() #9 /var/www/proyec/index.php(203): require_once('/var/www/picon/...') #10 {main} thrown in /var/www/proyec/system/database/drivers/pdo/pdo_driver.php on line 114 


And I have installed php5-sqlite on my Linux.
It's my first project with CI, sorry if its a silly mistake