PHP start_session() error

Cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly.

I am getting this erro开发者_JAVA百科r while accessing the database. and in my project session is getting cleared automatically and i could not able to connect to server through filezilla .can you tell me how to solve this problem

Please set error_reporting to E_ALL and display errors set to On. You will see some PHP error messages logged when you get this message.

It might be that IIS doesn't have write permissions to your temp directory where the sessions are stored.