The visibility zoom range in the BuildingStack asset is set as follows:

I believe the value 25 is causing the exception in the following code.
private static double Resolution(int zoom)
{
return InitialResolution / PowerTable2[zoom];
}
This is because PowerTable2 is defined as follows:
private static readonly int[] PowerTable2 = new int[24]
{
1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608
};