Tried to upload a file with the following text to the heroku website:
name,ID,R[pc],V[km/s],SurfDens[Msun/pc^2]
MarkSwinbank,1,110.,45.,1.0e+04
MarkSwinbank,2,116.,82.,2.2e+04
MarkSwinbank,3,105.,63.,4.0e+04
MarkSwinbank,4,160.,74.,2.8e+04
MarkSwinbank,5,300.,56.,8.6e+03
Here is the text I entered:

I get the standard "The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.” error message when I hit submit.