How do I make a bloom/glow effect?

While trying to use this code in the create event nothing happens

_fx_struct = fx_create("_effect_glow");

if _fx_struct != -1 {       fx_params = fx_get_parameters(_fx_struct);    fx_set_parameter(_fx_struct, "g_Radius", 15);       fx_set_parameter(_fx_struct, "g_Quality", 5);       fx_set_parameter(_fx_struct, "g_Gamma", 0);         fx_set_parameter(_fx_struct, "g_Intensity", 0.5);       fx_set_parameter(_fx_struct, "g_Alpha", 1);         //layer_set_fx("Player", _fx_struct); }

when i use this code

if true {    fx_params = fx_get_parameters(_fx_struct);    fx_set_parameter(_fx_struct, "g_Radius", 15);    fx_set_parameter(_fx_struct, "g_Quality", 5);     fx_set_parameter(_fx_struct, "g_Gamma", 0);    fx_set_parameter(_fx_struct, "g_Intensity", 0.5);    fx_set_parameter(_fx_struct, "g_Alpha", 1);         //layer_set_fx("Player", _fx_struct); }

still nothing happens.

I was hoping for Oshader to have a glowing bloom effect

and whenever i go into another room it just gives me this error

############################################################################################ ERROR in action number 1 of Draw Event for object oshader: fx_get_name() - parameter should be an FX object at gml_Object_oshader_Draw_0 (line 12) - show_debug_message(fx_get_name(layer_get_fx("Instances_1"))) ############################################################################################ gml_Object_oshader_Draw_0 (line 12)

I don't know what a FX object is.

here's the draw event code

show_debug_message(fx_get_name(layer_get_fx("Instances_1")))