I am getting 500 internal server error; here is my .htaccess code
AuthName "admin"
AuthUserFile "/home/machiner/.htpasswds/public_html/passwd"
# mod_pagespeed configuration - Do NOT modify the contents
<IfModule pagespeed_module>
ModPagespeedDomain *
ModPagespeed on
</IfModule>
# End of mod_pagespeed configuration- Do NOT modify the contents