Fixing 500 Internal Server Error

Hi,
Am fairly new to wordpress and working with websites so I apologise if I’m a little slow.

I’ve just started to setup my website https://www.clarencevalleycrossfit.com.au/ when all of a sudden I’ve recieved an Internal Server error. I’m not no longer able to access my website through any means and am now stuck, please if you can help in any way I would be most appriciative. Thankyou again

P.S.
I’m pasting an error log that I got off the server if that helps diagnose the issue…

[29-Jan-2015 22:46:07 UTC] WordPress database error Can’t lock file (errno: 165 “Table is read only”) for query DELETE FROM wp_options WHERE option_name = ‘rewrite_rules’ made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, cpt_classes, flush_rewrite_rules, WP_Rewrite->flush_rules, delete_option
[29-Jan-2015 22:46:07 UTC] WordPress database error Can’t lock file (errno: 165 “Table is read only”) for query DELETE FROM wp_options WHERE option_name = ‘rewrite_rules’ made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, tax_classes, flush_rewrite_rules, WP_Rewrite->flush_rules, delete_option
[29-Jan-2015 22:46:07 UTC] WordPress database error Can’t lock file (errno: 165 “Table is read only”) for query DELETE FROM wp_options WHERE option_name = ‘rewrite_rules’ made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, cpt_trainers, flush_rewrite_rules, WP_Rewrite->flush_rules, delete_option
[29-Jan-2015 22:46:07 UTC] WordPress database error Can’t lock file (errno: 165 “Table is read only”) for query DELETE FROM wp_options WHERE option_name = ‘rewrite_rules’ made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, tax_trainers, flush_rewrite_rules, WP_Rewrite->flush_rules, delete_option
[29-Jan-2015 22:46:12 UTC] WordPress database error Can’t lock file (errno: 165 “Table is read only”) for query DELETE FROM wp_options WHERE option_name = ‘rewrite_rules’ made by require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, cpt_classes, flush_rewrite_rules, WP_Rewrite->flush_rules, delete_option