Demo import does not work

Warning: Illegal string offset ‘template’ in /brainyminute/wordpress/wp-content/plugins/elementor/core/settings/page/manager.php on line 242

Fatal error: Uncaught TypeError: Argument 1 passed to Elementor\Controls_Stack::sanitize_settings() must be of the type array, string given, called in /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php on line 1051 and defined in /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php:2290
Stack trace:
#0 /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php(1051): Elementor\Controls_Stack->sanitize_settings()
#1 /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php(2039): Elementor\Controls_Stack->get_data()
#2 /brainyminute/wordpress/wp-content/plugins/elementor/core/base/base-object.php(142): Elementor\Controls_Stack->get_init_settings()
#3 /brainyminute/wordpress/wp-content/plugins/elementor/core/base/base-object.php(40): Elementor\Core\Base\Base_Object->ensure_settings()
#4 /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php(1065): Elementor\Core\Base\Base_ in /brainyminute/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php on line 2290

The same thing happens to me, when installing “cosmos WP” and “Advanced Import” it does not install demo pages

Capture https://drive.google.com/uc?export=download&id=10muCXenXQZvW3ioKmlIgc5n0ivW44OHr

@conextic please make sure your internet connection is working properly and refresh the page.

@ceylonthemes Can you provide the theme name/link?

Found the issue related to this error – If the demo has custom widgets (in a theme or a plugin), installing such demos without a related plugins, elementor generate this error.

Installing demo first time OK, but installing a demo second time – Error

“Plugin Does not exist / Error contact the theme author”

@ceylonthemes can you send the code of the plugins array?
Code Example of Advanced Import

'plugins' => array(
                array(
                    'name'      => __( 'Gutentor', 'text-domain' ),
                    'slug'      => 'gutentor',
                ),
                array(
                    'name'      => __( 'Contact Form 7', 'text-domain' ),
                    'slug'      => 'contact-form-7',
                    'main_file' => 'wp-contact-form-7.php',/*the main plugin file of contact form 7 is different from plugin slug */
                ),
            )