I can not copy the demo from Ultimate E. to my page. This Error appers everytime

370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-content/plugins/doubly-pro/inc_php/operations.class.php(776): UniteFunctionsDOUBLY::throwError()
#1 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-content/plugins/doubly-pro/inc_php/actions.class.php(247): Doubly_Operations->getCopiedZipContentFromData()
#2 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-content/plugins/doubly-pro/inc_php/admin.class.php(191): Doubly_AjaxActions->onAjaxActions()
#3 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-includes/class-wp-hook.php(310): Doubly_PluginAdmin->onAjaxActions()
#4 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters()
#5 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#6 /home/370581.cloudwaysapps.com/hnwebsvqna/public_html/wp-admin/admin-ajax.php(203): do_action()