Looking at the SAR_cfg_grps_lingor.sqf it appears that you're missing a few things in the code.
_this = createMarker ["SAR_El_Presedente", [8113.03,6722.69,0.001]];
_this setMarkerShape "RECTANGLE";
_this setMarkeralpha 0;
_this setMarkerType "Flag";
_this setMarkerBrush "Solid";
_this setMarkerSize [4500, 4500];
SAR_El_Presedente = _this;
Should be:
_this = createMarker ["SAR_area_El_Presedente", [8113.03,6722.69,0.001]];
_this setMarkerShape "RECTANGLE";
_this setMarkeralpha 0;
_this setMarkerType "Flag";
_this setMarkerBrush "Solid";
_this setMarkerSize [4500, 4500];
SAR_marker_El_Presedente = _this;
And
[SAR_EL_Presedente,1,2,10, "fortify", false] call SAR_AI;
Should be:
[SAR_marker_EL_Presedente,1,2,10, "fortify", false] call SAR_AI;
I am not positive if the capitals and underscores in the naming of the markers matter but I just use simple one word lower case marker names. You can try it the way you have the names but if it still doesn't work, go with one word marker names. Hope this helps