Comments - delproti

When I launch the .exe, it gives me this error:

ERROR in
action number 1
of Other Event: Game Start
for object obj_persistent:

Error defining an external function.

called from - gml_Script_FS_init (line 0)
called from - gml_Object_obj_persistent_Other_2 (line 9)

And continues to give me this error with increasing lines. I continue to click Ignore and I can go to the menu but if I press enter (to start) it gives me another error that I can't ignore:

FATAL ERROR in
action number 1
of Create Event
for object obj_mainmenu:

string_replace argument 1 incorrect type (0) expecting a String (YYGS)

called from - gml_Script_scr_level_get_levels (line 19)
called from - gml_Object_obj_mainmenu_Create_0 (line 22)