game maker modifying windy woods game

Question

I am a complete beginner in using game engines and creating games in general I have a project to implement and I am trying to learn while implementing it at the same time currently, I am using the Windy Woods template to build on it and have it execute the functionality that I want I wanted to create a landing page and make it the first one when opening the game but I am getting an error and I am not sure where is it coming from:

############################################################################################ ERROR in action number 1 of Step Event1 for object obj_character_parent: Unable to find instance for object index 24 at gml_Script_check_collision (line 17) - var _left_top = tilemap_get_at_pixel(obj_game_manager.collision_tilemap, bbox_left + _move_x, bbox_top + _move_y); ############################################################################################ gml_Script_check_collision (line 17) gml_Object_obj_character_parent_Step_1 (line 6) - grounded = check_collision(0, 1);