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Hi there,
The save_my_custom_field function is not part of the “Price Based on Country” code. In addition, I don’t see a reference to a file included in “Price Based on Country” in the error trace.
All files included in Price Based on Country are under the directory “plugins/woocommerce-product-price-based-on-countries/.”
Please also note that the plugin’s name is “Price Based on Country for WooCommerce.” Other plugins are called “Price By Country,” so please re-check that you posted your issue in the correct support forum.