Service "ERROR: Unable to load type" for a remote Master

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My setup is an Ubuntu 16.04 LTS VM on Win10, and RaspberryPi running Ubuntu Mate 16.04 LTS. I have ROS Kinetic installed on both of the Ubuntu machines and they can ping each other with hostname fine.
I wrote a new node on my remote Master (which is the RPi) that exposes 2 services and I can call the services fine locally on the RPi. The node is reachable from the Ubuntu VM, I can rosnode ping and can see it in rosservice list. However, when I rosservice info it from the VM, I get:

$ rosservice info get_humid_rh  
Node: /sht15_node  
URI: rosrpc://mlotfy-pi:36003  
Type: sht15/GetHumidRh  
ERROR: Unable to load type [sht15/GetHumidRh].  
Have you typed 'make' in [sht15]?

When I try to rosservice call it from the VM, I get:

$ rosservice call get_humid_rh  
ERROR: Unable to load type [sht15/GetHumidRh].  
Have you typed 'make' in [sht15]?

What could be missing here?