Additional info : found Extensions Error Report. AND discovered there were 2 instances of Revit 2013 running along with 2014. Resolved now by shut down and restart
REX:
Engine version: 2014; Version name: ; Culture info: en-US
PLATFORM:
Win32NT Microsoft Windows NT 6.1.7601 Service Pack 1
SOURCE:
AREX
MESSAGE: (20/06/2013 08:15:39)
REX startup failed: The process cannot access the file 'C:\Users\David\AppData\Roaming\Autodesk\REX\2013\Revit\Architecture\tree_Revit.xml' because it is being used by another process.: The process cannot access the file 'C:\Users\David\AppData\Roaming\Autodesk\REX\2013\Revit\Architecture\tree_Revit.xml' because it is being used by another process.; StackTrace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.Xml.XmlDocument.Save(String filename)
at REX.Manager.Manager.FindNewModules(REXContext context, Settings settings)
at REX.Common.Start.REXStartProxy.PrepareData(Dictionary`2& dict, List`1& keys)
at REX.Common.Start.REXStartProxy.OnStartup()
DEPENDENCY: Autodesk.REX.Framework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=51e16e3b26b42eda (file version: 2012.0.0.1709) | REX.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.Controls.WPF, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.Controls.Forms, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.Mathematics, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.Preferences, Version=2013.0.0.2251, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.System, Version=2013.0.0.2251, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251) | REX.Service, Version=2013.0.0.2251, Culture=neutral, PublicKeyToken=null (file version: 2013.0.0.2251)
LAST ENTRIES: 4 / 2
1: (02/05/2013 08:31:43)
AREX.REX.Foundation - Create method exception.
Assembly name: DSteelConnB2CEP: Object reference not set to an instance of an object.; StackTrace: at REX.Common.Geometry.REXGeometry.GetDistance(REXxyz p1, REXxyz p2)
at REX.Common.Geometry.REXSectionGeometry.GetRadArc(REXxyz pt1, REXxyz pt2, REXxyz vect2)
at REX.Common.Geometry.REXSectionGeometry.ToVertexContour(List`1 contour, List`1 vContour, REXAnalizeType analizeType)
at REX.Common.Geometry.REXSectionGeometry.Analyse(List`1 contour, REXAnalizeType anlizeType)
at REX.Common.Revit.Geometry.REXElement.CreateGeomSection(XYZArray points, REXSectionTypeCut sectionCut)
at REX.Common.Revit.Geometry.REXAnalyseElement.REXColumn.RunMain(Options geoOptions, Boolean originalGeometry)
at REX.Common.Revit.Geometry.REXAnalyseElement.GetElemSteel(Element familyInst, Boolean originalGeometry)
at REX.DSteelConnB2CEP.RevitB2CEPFactory.SetConnectionGeometry()
at REX.DSteelConnB2CEP.RevitB2CEPFactory.SetConnectionFromSelection(Boolean CreateNewIfNotExist)
at REX.Common.Revit.Steel.Connections.REXConnectionBaseFactory_RVT`4.OnCreate()
at REX.Common.REXExtension.Create()
at REX.DSteelConnB2CEP.Extension.Create()
at REX.Common.REXApplication.Create(REXContext& AppContext)
