Grasshopper

algorithmic modeling for Rhino

Topography Component Error: 1. Solution exception:Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Hello, 

I'm just taking my first steps with Elk and I've immediately come up against an issue with the Topography component. 

After connecting the Latitude and Longitude domains from the Location component the Topography component registers the following error: 1. Solution exception:Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

I tried constructing a domain using positive longitude value, which did cause the error notice to go away but did not produce any geometry. These longitude values are negative however because this location is West of the Prime Meridian, which I have to imagine Elk would understand. 

Hoping there's a simple answer that I'm overlooking. I've included a screenshot of the definition. 

Thanks in advance for any help. 

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