Please review this post:
http://forums.autodesk.com/t5/revit-api/revit-to-ifc-unrecoverable-error-during-export/td-p/5946695
Also I advice to Audit and Purge your Revit project file first before you try to export.
Try diffent exporter of IFC.
Please review this post:
http://forums.autodesk.com/t5/revit-api/revit-to-ifc-unrecoverable-error-during-export/td-p/5946695
Also I advice to Audit and Purge your Revit project file first before you try to export.
Try diffent exporter of IFC.