This EasyPBI bug has been discovered and fixed in source already. As a workaround until the Port/PBI get updated, you will need to start EasyPBI from the command line (run "EasyPBI") and try to build a PBI normally. Once it fails with the above error, close the GUI and look at the terminal output for EasyPBI. It should have displayed the terminal command to build the PBI, and you just need to run that command (cut & paste) from the terminal.
Once this has been done once, you can use EasyPBI from the GUI anytime after that.
~ Ken Moore ~