When I try to run the game, it pops up a window saying :

FATAL ERROR in Vertex Shader compilation
ShaderName: shd_pal_swapper

D3DXCompile failed - result

at gml_Script_pal_swap_set
stack frame is
gml_Script_pal_swap_set (line -1)
gml_Object_omenu_front_Draw_

Is there a way to fix this??