The “Error accessing the metadata while loading/storing objects” often occurs when the user who started the Denodo server does not have sufficient administrative privileges to access/store the metadata. I am assuming that you started the Denodo VirtualDataport Administration tool as administrator but it is possible that you may not have started the Virtual DataPort Server as an administrator. Apart from starting the Virtual DataPort Administration tool as an administrator, the Virtual Dataport Server should be started as an Administrator respectively.
You can test your case by following the steps below:
1. Open the Denodo Control Center with the option “Run as administrator”.
2. Start the Virtual DataPort Server.
3. Launch the Denodo Virtual DataPort Administration Tool and execute the job.
Hope this helps!