Error inside vim when opening a test file with a running nrepl

error

Error detected while processing function <SNR>47_path..<SNR>47_connect:
line   10:
E117: Unknown function: fireplace#register_port_file
E15: Invalid expression: empty(portfile) ? {} : fireplace#register_port_file(portfile, b:leiningen_root)
Error detected while processing FileType Auto commands for "clojure":
E714: List required
Error detected while processing function <SNR>47_projectionist_detect..<SNR>47_path
..<SNR>47_connect:
line   10:
E117: Unknown function: fireplace#register_port_file
E15: Invalid expression: empty(portfile) ? {} : fireplace#register_port_file(portfile, b:leiningen_root)

Here's what I'm doing:

1. start a new tmux session (v1.9a)
2. edit a leiningen project (vim .)
3. :Console
4. wait for repl to run
5. edit a test file (:Etest my_project/core)

After that series, I see the above. It's worth noting that the project is empty and I'm seeing it in a project that was generated under leiningen 2.3.4 (I upgraded to 2.4.1 to see if the error would go away, but it persists under 2.4.1).

Aaand I needed to update vim-fireplace. derp.