Various issues

We have a couple of questions about the theme and we found some bugs. URL of live site is https://www.jdtours.com

1. We have TravelWP Version: 1.1.8. installed. Also we have WP version 5.2.4. As SEO plugin we use Yoast SEO Premium version 12.3.
When we try to update the SEO settings for the page https://www.jdtours.com/tours/ which indicated as main shop page in the WooCommerce https://www.jdtours.com/wp-admin/admin.php?page=wc-settings&tab=products
we receive the error.
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Recoverable fatal error: Object of class WP_Error could not be converted to string in /usr/www/users/jdtours/public_html_w/wp-includes/formatting.php on line 4189
The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.
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Where is the problem? How to fix it?

2. What is the correct way to update TravelWP from our current version 1.1.8 to the latest version you have?
Sorry but after we update theme on our devel server, we lost a lot of settings. Please check http://jdtour.stage.quartsoft.com/ Tours section doesn’t work at all http://jdtour.stage.quartsoft.com/tour-category/private-tours/

So could you assist with this question somehow?