Export to gbXML failing

[Anonymous]

I am trying to export a project from revit as a gbXML file. When I click export it fails and tells me to check the project information. I believe the problem is my conceptual mass but I am unsure how to fix it.

[Ahmed_Muharram]

This error displays when you attempt to export to gbXML and the building model does not contain any room-bounding elements in the specified phase.

Error: Can’t create any energy analysis surfaces. There are no room bounding elements defined in the current phase. Please check the Project Information settings.

Solution: Do the following:

• Make sure that appropriate elements (such as walls and roofs) in the building model are room-bounding.
• Click Manage tab Settings panel (Project Information). In the Instance Properties dialog, for Energy Data, click Edit. In the Energy Settings dialog, for Project Phase, specify the phase for which you want to perform the energy analysis. This phase should be one in which room-bounding elements exist.

check this link https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2016/EN...