Suddenly some errors are coming

I am having a login page which goes to login process file. I have a include file which connects to database. Till now all was ok suddenly it started showing following --------------------------- Warning: main(): stream does not support seeking in /home2/www/members/login-px.php on line 6 ------------------------ This line is nothing but where i included my file for database connection. My client got very upset, i am also not understanding why suddenly this popped out when for last 6 months nothing was wrong. I did not change anything neither my client. I tested db connection separately - it is ok. Then what can be the problem? The environment is Apache / MySQL / Linux / PHP. Thanks in advance, regards manisha