StoreOne Pro PHP Warnings/Errors

Hi there,
I’m new to WordPress and am just building my first WordPress site, I am working on localhost so I can’t include a link – sorry. I have some HTML & CSS knowledge but have not used PHP. Hopefully someone out there can help me with the problem below.

I apologise in advance if this is a ‘bit messy’ as I said I’m new to WP ??

I purchased and installed storeone-pro in wordpress, but it caused a critical error on my site. There are FOUR errors:

FIRST TWO ERRORS
Warning: Trying to access array offset on value of type null in /Applications/XAMPP/xamppfiles/htdocs/WebDevelopment/inspirationalArt/wp-content/themes/storeone-pro/admin/inc/class-themefarmer-about-page.php on line 42

Warning: Trying to access array offset on value of type null in /Applications/XAMPP/xamppfiles/htdocs/WebDevelopment/inspirationalArt/wp-content/themes/storeone-pro/admin/inc/class-themefarmer-about-page.php on line 43

THE CODE FROM LINES 42 and 43 IS:
$this->action_count = $actions[‘count’];
$this->recommended_actions = $actions[‘actions’];

HERE IS THE WHOLE SECTION OF CODE FROM THE ABOVE PHP DOC (the first line is line 32 and the last line 49

function __construct() {
			$this->theme            = wp_get_theme();
			
			$this->demo_link  = 'https://demo.themefarmer.com/storeone-pro/?utm_source=storeone-dashboard&utm_medium=demo-scope&utm_campaign=welcome-page';
			$this->docs_link  = 'https://docs.themefarmer.com/storeone-pro-documentation/?utm_source=storeone-dashboard&utm_medium=documentation-scope&utm_campaign=welcome-page';
			$this->theme_page = 'https://www.themefarmer.com/product/storeone-pro/?utm_source=storeone-pro-dashboard&utm_medium=storeone-pro-link&utm_campaign=visie-theme-page';
			$this->pro_link   = '';
			$this->support_link = 'https://www.themefarmer.com/support/';

			$actions                   = $this->get_recommended_actions();
			$this->action_count        = $actions['count'];
			$this->recommended_actions = $actions['actions'];

			add_action('admin_menu', array($this, 'add_theme_info_menu'));
			add_action('admin_enqueue_scripts', array($this, 'enqueue'));
			add_action('wp_ajax_storeone_update_rec_acts', array($this, 'update_recommended_actions_watch'));
			add_action('load-themes.php', array($this, 'activation_admin_notice'));
		}

——————

THIRD AND FOURTH ERRORS
Deprecated: Required parameter $args follows optional parameter $depth in /Applications/XAMPP/xamppfiles/htdocs/WebDevelopment/inspirationalArt/wp-content/themes/storeone-pro/inc/menu-walker.php on line 43

Deprecated: Required parameter $output follows optional parameter $depth in /Applications/XAMPP/xamppfiles/htdocs/WebDevelopment/inspirationalArt/wp-content/themes/storeone-pro/inc/menu-walker.php on line 43

HERE IS THE SECTION OF CODE FROM THE ABOVE PHP DOC (the first line of this copied code is line 43)

function display_element($element, &$children_elements, $max_depth, $depth = 0, $args, &$output) {

		if (!$element) {
			return;
		}

		$id_field = $this->db_fields['id'];

		//display this element
		if (is_array($args[0])) {
			$args[0]['has_children'] = !empty($children_elements[$element->$id_field]);
		} else if (is_object($args[0])) {
			$args[0]->has_children = !empty($children_elements[$element->$id_field]);
		}

		$cb_args = array_merge(array(&$output, $element, $depth), $args);
		call_user_func_array(array($this, 'start_el'), $cb_args);

		$id = $element->$id_field;

		// descend only when the depth is right and there are childrens for this element
		if (($max_depth == 0 || $max_depth > $depth + 1) && isset($children_elements[$id])) {

			foreach ($children_elements[$id] as $child) {

				if (!isset($newlevel)) {
					$newlevel = true;
					//start the child delimiter
					$cb_args = array_merge(array(&$output, $depth), $args);
					call_user_func_array(array($this, 'start_lvl'), $cb_args);
				}
				$this->display_element($child, $children_elements, $max_depth, $depth + 1, $args, $output);
			}
			unset($children_elements[$id]);
		}

		if (isset($newlevel) && $newlevel) {
			//end the child delimiter
			$cb_args = array_merge(array(&$output, $depth), $args);
			call_user_func_array(array($this, 'end_lvl'), $cb_args);
		}

		//end this element
		$cb_args = array_merge(array(&$output, $element, $depth), $args);
		call_user_func_array(array($this, 'end_el'), $cb_args);
	}

I am using the ‘Open Store child theme’
I am not familiar with php so I do not know how to fix this – please help.
I contacted ThemeFarmer (who I purchased the theme from) a week ago and have not had any response.
Thank you
Jilly