Uncaught Error: Call to undefined function get_woocommerce_currency_symbol()

Recieved the error on your plugin.. sending details
Error Details
=============
An error of type E_ERROR was caused in line 127 of the file /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-content/plugins/sales-countdown-timer/admin/admin.php. Error message: Uncaught Error: Call to undefined function get_woocommerce_currency_symbol() in /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-content/plugins/sales-countdown-timer/admin/admin.php:127
Stack trace:
#0 /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-includes/class-wp-hook.php(308): SALES_COUNTDOWN_TIMER_Admin_Admin->settings_checkout_countdown(”)
#1 /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array)
#2 /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /chroot/home/abe8a72a/39949c81a4.nxcli.net/html/wp-admin/admin.php(259): do_action(‘countdown-timer…’)
#4 {main}
? thrown