Please fix your settings in config.php:
You have:
$CFG->dirroot = "/var/www/lms/km/mr";
but it should be:
$CFG->dirroot = "/var/www/lms/km_root";
You have:
$CFG->dirroot = "/var/www/lms/km/mr";
but it should be:
$CFG->dirroot = "/var/www/lms/km_root";