“Uncaught Error: Call to undefined function”

This has been working for more than a year. Now this:

Uncaught Error: Call to undefined function fusion_is_color_transparent() in /home/customer/www/firrp.org/public_html/wp-content/plugins/fusion_cptt/includes/fusion-blog-cpt.php:1575 Stack trace: #0 /home/customer/www/firrp.org/public_html/wp-includes/class-wp-hook.php(303): FusionSC_Blog_CPT->post_wrapper_attr(Array) #1 /home/customer/www/firrp.org/public_html/wp-includes/plugin.php(189): WP_Hook->apply_filters(Array, Array) #2 /home/customer/www/firrp.org/public_html/wp-content/plugins/fusion-builder/inc/class-fusion-builder.php(2178): apply_filters('fusion_attr_blo...', Array) #3 /home/customer/www/firrp.org/public_html/wp-content/plugins/fusion_cptt/includes/fusion-blog-cpt.php(816): FusionBuilder::attributes('blog_cpt-fusion...') #4 /home/customer/www/firrp.org/public_html/wp-includes/shortcodes.php(356): FusionSC_Blog_CPT->render(Array, '', 'fusion_blog_cpt') #5 [internal function]: do_shortcode_tag(Array) #6 /home/customer/www/firrp.org/public_html/wp-includes/shortcodes.php(228): preg_replace_callback( in /home/customer/www/firrp.org/public_html/wp-content/plugins/fusion_cptt/includes/fusion-blog-cpt.php on line 1575

How do I fix this?

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