[Lua] Create Improvement by lua of the map, how to? Solved

How to create Improvement by lua of the map?

There is a LUA's scripts for creating a separate maps. In those we can do like this:
plot:SetPlotType(PlotTypes.PLOT_LAND);
and this:
plot:SetTerrainType(TerrainTypes.TERRAIN_PLAINS);
and this:
plot:SetFeatureType(FeatureTypes.FEATURE_FOREST);

It's worked exactly expected.

But if I try same for imrovements it's not worked:
plot:SetImprovementType(ImprovementTypes.IMPROVEMENT_GOODY_HUT);


[166622.967] Runtime Error: ***.lua:279: attempt to index a nil value
stack traceback:

Where is a mistake?

 

Problem solved with premaded vars. For Example

local IGH = GameInfo.Improvements["IMPROVEMENT_GOODY_HUT"].ID;
plot:SetImprovementType(IGH)

 

The problem is that ImprovementTypes does not exist. No need to predefine those variables, you can also just do:

plot:SetImprovementType(GameInfo.Improvements["IMPROVEMENT_GOODY_HUT"].ID)

Or alternatively:

plot:SetImprovementType(GameInfoTypes.IMPROVEMENT_GOODY_HUT)