使用.htaccess获取500内部服务器错误

I am new in .htaccess i have write a .htaccess file like

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l

RewriteRule ^(.+) index.php?url=$1 [QSA, L]

now i am running my url in the browswer like localhost/my_project/

its give me following error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

i have starts rewrite module in my wamp server. also check error logs there is last line is

HTTP/1.1" 500 535

There is a space too much!

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l

#Remove that space between QSA, and L
RewriteRule ^(.+) index.php?url=$1 [QSA,L]