How to solve this error fatal error : uncought type error non-static method

Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($function) must be a valid callback, non-static method RtclPro\Controllers\TermMetas::category_add_map_icon_field() cannot be called statically in C:\xampp\htdocs\AlenAddisCar\wp-includes\class-wp-hook.php:292 Stack trace: #0 C:\xampp\htdocs\AlenAddisCar\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters('', Array) #1 C:\xampp\htdocs\AlenAddisCar\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #2 C:\xampp\htdocs\AlenAddisCar\wp-admin\edit-tags.php(529): do_action('rtcl_category_a...', 'rtcl_category') #3 {main} thrown in C:\xampp\htdocs\AlenAddisCar\wp-includes\class-wp-hook.php on line 292

if ( 0 == $the_['accepted_args'] ) {
					$value = call_user_func( $the_['function'] );
				} elseif ( $the_['accepted_args'] >= $num_args ) {
					$value = call_user_func_array( $the_['function'], $args );
				} else {
					$value = call_user_func_array( $the_['function'], array_slice( $args, 0, (int) $the_['accepted_args'] ) );
				}
			}