So a new GMS2 update came out and got rid of one of the constants, giving you an error like this:

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Create Event
for object WaterRockAnimatedTile:
Variable WaterRockAnimatedTile.buffer_network(100992, -2147483648) not set before reading it. at gml_Script___lnc_const_decl_f13 (line 33) -        gml_const_add("buffer_network",buffer_network);
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Script___lnc_const_decl_f13 (line 33)
called from - gml_Script___lnc_const_decl (line 16) -        __lnc_const_decl_f13();
called from - gml_Script_live_preinit_api (line 28) - __lnc_const_decl();
called from - gml_Script_live_preinit (line 111) - live_preinit_api();

This update fixes that. You can also fix it yourself by opening GMLAPI.gml with a text editor and commenting out the line where the error is (Ctrl+F "buffer_network"). This is the same for any other issues related to functions mismatching between your GMS/GMS2 version and GMLive - you just remove the missing ones.