Add Widget not working strange error

i cant create widget appear this error:
https://ibb.co/Qd5KJ6k
https://ibb.co/tBZ8GtD

Field Addon Name allow only english words, numbers and underscore.
#0 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/inc_php/framework/functions.class.php(1350): UniteFunctionsUC::throwError('Field Addon ...')
#1 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/inc_php/unitecreator_addon.class.php(107): UniteFunctionsUC::validateAlphaNumeric('Toggle Selected...', 'Addon Name')
#2 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/inc_php/unitecreator_addon.class.php(2317): UniteCreatorAddonWork->validateName('Toggle Selected...')
#3 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/inc_php/unitecreator_addons.class.php(790): UniteCreatorAddonWork->addSmall('Toggle element', 'Toggle Selected...', '', 0, 'elementor')
#4 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/inc_php/unitecreator_actions.class.php(188): UniteCreatorAddons->createFromManager(Array)
#5 /var/web/staging/public_html/wp-content/plugins/unlimited-elements-for-elementor/unitecreator_admin.php(318): UniteCreatorActions->onAjaxAction()
#6 /var/web/staging/public_html/wp-includes/class-wp-hook.php(286): UniteCreatorAdmin->onAjaxAction('')
#7 /var/web/staging/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#8 /var/web/staging/public_html/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#9 /var/web/staging/public_html/wp-admin/admin-ajax.php(173): do_action('wp_ajax_unlimit...')
#10 {main}