FATAL ERROR INSTALLING PRE-BUILD SITE

Hello,

I am trying to install pre-build webstie "Clothing 2" into my new fresh wordpress site, but keep experiecing error.

Fatal error: Uncaught Exception: Invalid post. in /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/settings/page/manager.php:101 Stack trace: #0 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/base/document.php(1462): Elementor\Core\Settings\Page\Manager->ajax_before_save_settings() #1 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/base/document.php(674): Elementor\Core\Base\Document->save_settings() #2 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(270): Elementor\Core\Base\Document->update_settings() #3 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(296): Mfn_Importer->elementor_settings() #4 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(867): Mfn_Importer->import_content() #5 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/class-wp-hook.php(292): Mfn_Importer->import() #6 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #7 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/plugin.php(484): WP_Hook->do_action() #8 /home/u278239088/domains/mimiboutique.lt/public_html/wp-admin/admin.php(259): do_action() #9 {main} thrown in /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/settings/page/manager.php on line 101

There has been a critical error on this website. Please check your site admin email inbox for instructions.

in email:

Error Details

=============

An error of type E_ERROR was caused in line 101 of the file /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/settings/page/manager.php. Error message: Uncaught Exception: Invalid post. in /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/settings/page/manager.php:101

Stack trace:

#0 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/base/document.php(1462): Elementor\Core\Settings\Page\Manager->ajax_before_save_settings()

#1 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/plugins/elementor/core/base/document.php(674): Elementor\Core\Base\Document->save_settings()

#2 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(270): Elementor\Core\Base\Document->update_settings()

#3 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(296): Mfn_Importer->elementor_settings()

#4 /home/u278239088/domains/mimiboutique.lt/public_html/wp-content/themes/betheme/functions/importer/class-mfn-importer.php(867): Mfn_Importer->import_content()

#5 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/class-wp-hook.php(292): Mfn_Importer->import()

#6 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()

#7 /home/u278239088/domains/mimiboutique.lt/public_html/wp-includes/plugin.php(484): WP_Hook->do_action()

#8 /home/u278239088/domains/mimiboutique.lt/public_html/wp-admin/admin.php(259): do_action()

#9 {main}

Tired of trying to install this theme now, please help.

I have updated Elemenator and activated all plugins. Nothing seems to help.