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Hi @mmcginnis,
Greetings from WebToffee support. It seems like the error message is not caused by the Smart Coupons for WooCommerce plugin developed by WebToffee. Please check the same after uninstalling the WebToffee plugin and check the same.
If you are using the Smart Coupon by another development team, we recommend reaching out to their support as they would be better equipped to handle this issue.
Thank you for your understanding.