Custom workflow in VRO using VRA Action giving TypeError

Hi

I am currently experiencing a problem where I have created a custom workflow to edit the building state of a virtual machine provisioning cycle and the workflow keeps failing at the action addUpdatePropertyFromVirtualMachineEntity with the following error:

TypeError: Cannot call method "getLink" of null (Dynamic Script Module name : addUpdatePropertyFromVirtualMachineEntity#7)

Anybody have any ideas as to what might cause this as this is a pre-buil action that is part of the vRA plugin for vRO.

Thank in advance

S

----never mind got it fixed, turns out one of the VM:entity mappings within the workflows was set to null hence the problem.