Do you have a full TSC, not only the runway section, which I cut out above just for demonstration?
..."Additionally, you have to modify your runway block:"...
<[file][][]
<[tmsimulator_scenery_place][][]
<[string8][type][airport]>
<[string8][sname][Canberra Airport]> //Short name of airport
<[string8][lname][Canberra International Airport]> //Full name of airport
<[string8][icao][YSCB]> //ICAO Code
<[string8][country][AUSTRALIA]> // country
<[string8][coordinate_system][lonlat]>
<[vector2_float64][position][149.1944484 -35.3070266 ]> //main coordinate of airport
<[float64][height][575]> //average elevation in meters
<[float64][size][5000]>
<[vector2_float64][tower_position][149.1973814 -35.3014540]> //tower coordinates
<[float64][tower_height][30]> //tower height in meters
<[bool][autoheight][true]>
<[string8][lights][]>
<[list_tmsimulator_scenery_object][objects][]
>
<[list_tmsimulator_scenery_object_animated][objects_animated][]
>
<[list_tmsimulator_runway][runways][]
<[tmsimulator_runway][element][0]
<[vector2_float64][endpoint1][149.1944458 -35.3147936]> //start rwy 35
<[vector2_float64][endpoint2][149.1944498 -35.2903116]> //start rwy 17
<[vector2_float64][threshold1][149.1944458 -35.3147936]> //copy of 1
<[vector2_float64][threshold2][149.1944498 -35.2903116]> //copy of 2
<[float64][width][45.11]> //runway width in meters
<[string8][name1][35]> //runway sign 1
<[string8][name2][17]> //runway sign 2
<[string8][appltsys1][std]> //all bout lighting system
<[string8][appltsys2][std]> //see separate tutorial
<[string8][papi1][left]>
<[string8][papi2][none]>
<[string8][reil1][reil_uni]>
<[string8][reil2][reil_uni]>
>
<[tmsimulator_runway][element][1]
<[vector2_float64][endpoint1][149.1992952 -35.3103592]> //start rwy 30
<[vector2_float64][endpoint2][149.1851747 -35.3006615]> //start rwy 12
<[vector2_float64][threshold1][149.1992952 -35.3103592]> //copy of 1
<[vector2_float64][threshold2][149.1851747 -35.3006615]> //copy of 2
<[float64][width][45.11]> //runway width in meters
<[string8][name1][30]> //runway sign 1
<[string8][name2][12]> //runway sign 2
<[string8][appltsys1][std]> //all bout lighting system
<[string8][appltsys2][std]> //see separate tutorial
<[string8][papi1][left]>
<[string8][papi2][none]>
<[string8][reil1][reil_uni]>
<[string8][reil2][reil_uni]>
>
>
<[list_tmsimulator_startposition][start_positions][]
>
<[list_tmsimulator_parking_position][parking_positions][]
<[tmsimulator_parking_position][element][0]
<[tmvector2d][position][149.1915463 -35.3070823]> //parking coordinates
<[float64][heading][10.00]> //heading of aircraft
<[string8][name][Start Position #1]>
>
>
<[list_tmsimulator_view_position][view_positions][]
>
>
>