Any Update Available?

All the sudden the calculator plugin is causing an issue on my website and is not working. I deactivate the plugin and my site looks correct again. Here is the errors I received

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An error of type E_ERROR was caused in line 140 of the file /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/LiddMCDetails.php. Error message: Uncaught ArgumentCountError: serialize() expects exactly 1 argument, 2 given in /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/LiddMCDetails.php:140
Stack trace:
#0 /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/LiddMCDetails.php(140): serialize()
#1 /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/LiddMCDetails.php(73): LiddMCDetails->liddmc_mortgage_calculator_get_apt()
#2 /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/LiddMCForm.php(235): LiddMCDetails->getDetails()
#3 /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/display_form.php(31): LiddMCForm->getForm()
#4 /home/gtkok7113dz8/public_html/909loan.com/wp-content/plugins/responsive-mortgage-calculator/includes/shortcode.php(22): lidd_mc_display_form()
#5 /home/gtkok7113dz8/public_html/909loan.com/wp-includes/shortcodes.php(433): lidd_mc_shortcode()
#6 [internal function]: do_shortcode_tag()

As soon as I deactivate the plugin the page works and I can edit it, if the plugin is enabled, I cannot edit and it gives an error.

The page I need help with: [log in to see the link]