thanks for your answer
but i check the qa-config.php with maxjtechno program the file was without BOM of the UFT-8 !
i think this error is from session and cookies ,
When the PHP commands like echo output to have an echo before the header file that contains information session and cookie information is sent first to the client's browser, we placed the echo command to display information and a lead performs.
Now if you want the output of commands such as echo Change the values of the cookie and the session came to your mind?!!
On the late session and cookie values before the echo command is not sent to the browser and the server on the other hand do not
if it is true now there is a bug in script installer
how can i fix the bug?