@e-cone
Hmm.. When you did the upgrade to U5.6, what version of NodeCanvas you were using?
Support for Unity 5.5+ has been added in NodeCanvas 2.6.2+ (released 5 months ago), which version came along with a button to “Upgrade Project” from previous NodeCanvas versions and which button is shown in inspectors of Bound Graph Owners if required. Have you came along this button and thus run this upgrade before?
Let me know.
@anglo
I have replied to your other post about similar problem.