___________________________________________
ERROR in
action number 1
of Mouse Event for Left Button
for object o_level_menu_additionally:

Error in expression:block_b
  position 1: Unknown variable block_b

if !vspeed=0 && speed<0 {   
sprite_index="s_player_jump_left"; }   
if !vspeed=0 && speed>0 {   
sprite_index="s_player_jump_right"; }

if place_free(x,y+1) then gravity = 0.5 else gravity = 0;  

if vspeed < 0 and speed>0 then {sprite_index = s_player_jump_right; image_index = 0}  
else  
if vspeed > 0 and speed>0 then {sprite_index = s_player_jump_right; image_index = 1}

if vspeed < 0 and speed<0 then {sprite_index = s_player_jump_left; image_index = 0}  
else  
if vspeed > 0 and speed<0 then {sprite_index = s_player_jump_left; image_index = 1}

if !vspeed=0 && speed<0 {  
sprite_index="s_player_jump_left"; }  
if !vspeed=0 && speed>0 {  
sprite_index="s_player_jump_right"; }