Ok, why is this happening?

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentNullException: Value cannot be null.
Parameter name: source
at System.Linq.Enumerable.Where[TSource ...

Can this tell me how many miners/speed or productivity modules I will need to achieve a given input rate?