This is the error I am getting is
c:programData\Autodesk\RME 2012 Templates\US Imperial\Mechanical-Default.rte
I have already tryed to do this, add content us imperial content to my revit 2012 mep software 2 times from this option below. Uninstall or change a program, select the Revit application, and click Uninstall/Change.
I have also updated revit 2012 mep with the newest service pack 2 from here
http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=16841348
We are using windows 7 64 bit operating system
Please reinstall the software in diagnostics mode as described here
http://usa.autodesk.com/getdoc/id=TS75218