Cloudforms Virtual Maching Migrate Failure

Issue

• When in Cloudforms I go to Infrastructure -> Virtual Machines -> (Select a VM) -> Lifecycle -> Migrate this VM
  I am greeted with an error page:

Unexpected error encountered


Errors in Management Engine can be caused by:

① Accessing Management Engine from multiple tabs or windows of the same browser on a single machine.
      Close any duplicate browser sessions, then select a menu option above.
② Pressing the back button during a session.
      Close any duplicate browser sessions, then select a menu option above.
③ An internal system error.
      Please contact your administrator for assistance.


Error text:

can't convert Symbol into Integer [vm_infra/x_button]
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Is this a known issue, or something that is wrong in my setup?