M2_UGL_1 run workflow error module 2

In Module 2 (Reflection Design Pattern), on the 1st ungraded lab, in Section 4.2 (Try the workflow)— I run the code and it simply says run_workflow is not defined. I am not sure what this means or what to do about it. All the others seemed to run fine. Screenshot attached.

Did you run all of the cells in that notebook starting from the first one, and in sequence?