Issue "Assembly Reference could not be resolved", Octopus

I’m pretty sure to have installed Octopus correctly, in the component folder.
I’m having a pop-up similar to the attached images while opening the Octopus sample files.

Someone could help me to figure out how to overcome this issue?

Octopus 0.4
Rhino 6.34.21034.7001
Windows 10


moved to Grasshopper category.