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It seems that one image file is missing. 
Can I get the file below?  

It's in the "Tileset-Terrain" file. The rule is using tiles from this file. Usually I use a separate file with the same format so I don't need to rewrite the rules all over again but, for the baluster tiles, I use the tiles directly from the main "Tileset-Terrain" file because it's too specific for this asset.