VRO Update Manager Plugin Error

Hello,

I have been trying to run the Attach Baseline workflow. We have have Update Manager plugin 6.0.2 and VRO 7.2. When I expand the baselines, it gives me a message ERROR IN PLUGIN.

I have captured this java error:

Is this due to a mismatch in the plugin and the vcenter server? We are using the latest vCenter 6.5 update with the embedded VUM.

Thanks