Not able to successfully geomance a file via API geomance endpoint

[michelleminkoff]

When I try to form a request using Ruby's RestClient to geomance a spreadsheet of city names, I get a 500 InternalServerError back.

Here are the docs I'm looking at: http://geomancer.io/about#api. An example of how to use the geomance endpoint, using requests, even in Python, would be very helpful.

I have attached the file I am trying to geomance (I attached it as a txt due to GitHub Issues not liking my csv, but I have been trying to run it in my RestClient request as a csv.My request code looks like:
result = RestClient.post(
"http://geomancer.io/api/geomance/",
{
:form =>JSON.generate({0=>{'type'=>'city','append_columns'=>['total_population']}}),
:file=> File.new("allstatesmodified.csv", "rb")
}
)
If I log my request, I get: RestClient.post "http://geomancer.io/api/geomance/", 39458 byte(s) length, "Accept"=>"/; q=0.5, application/xml", "Accept-Encoding"=>"gzip, deflate", "Content-Length"=>"39458", "Content-Type"=>"multipart/form-data; boundary=48371"

It returns: 500 InternalServerError | text/html 2963 bytes

I see the same error in my JS console when I just try to access that page from Chrome: Failed to load resource: the server responded with a status of 500 (INTERNAL SERVER ERROR)

allstatesmodified.txt