not working

Hi,
I installed this plugin, but it doesn’t work properly.
I got below messages;
Warning
: DOMDocument::loadHTML() expects parameter 2 to be integer, string given in
plugins/uni-woo-custom-product-options/includes/uni-cpo-core-functions.php
on line
827
Fatal error
: Uncaught Error: Call to a member function appendChild() on null in plugins/uni-woo-custom-product-options/includes/uni-cpo-core-functions.php:831 Stack trace: #0 wp-includes/class-wp-hook.php(286): uni_cpo_woocommerce_get_price_html(‘<span class=”wo…’, Object(WC_Product_Simple)) #1 /wp-includes/plugin.php(203): WP_Hook->apply_filters(‘<span class=”wo…’, Array) #2 plugins/woocommerce/includes/abstracts/abstract-wc-product.php(1718): apply_filters(‘woocommerce_get…’, ‘<span class=”wo…’, Object(WC_Product_Simple)) #3 woocommerce/single-product/price.php(24): WC_Product->get_price_html() #4 plugins/woocommerce/includes/wc-core-functions.php(211): include(‘/home4/stosuner…’) #5 /home4/stosuner/public in
/plugins/uni-woo-custom-product-options/includes/uni-cpo-core-functions.php
on line
831

For your information.
Regards