OK here is whole error string... I believe the top is relating to extrude tools.
Error Loading File #extrusionToolbar.rb
can't convert nil into StringError Loading File 2D#.rb
can't convert nil into StringError Loading File __loader.rb
uninitialized constant TraductorError Loading File arc.rb
can't convert nil into StringError Loading File attributes.rb
can't convert nil into StringError Loading File babelfish.rb
can't convert nil into StringError Loading File bezier.rb
can't convert nil into StringError Loading File binary.rb
can't convert nil into StringError Loading File bootstrap_Curvizard.rb
uninitialized constant Curvizard::T6Error Loading File bounds.rb
can't convert nil into StringError Loading File color.rb
can't convert nil into StringError Loading File core.rb
can't convert nil into StringError Loading File cursor.rb
can't convert nil into StringError Loading File CurvizardAlgo.rb
uninitialized constant Curvizard::T6Error Loading File CurvizardTool.rb
uninitialized constant Curvizard::T6Error Loading File debug.rb
can't convert nil into StringError Loading File definition.rb
can't convert nil into StringError Loading File dimension.rb
can't convert nil into StringError Loading File edges.rb
can't convert nil into StringError Loading File entities.rb
can't convert nil into StringError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/examples/exampleScripts.rb
undefined method file_loaded?' for main:ObjectError Loading File examples.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByEdges.rb
undefined method file_loaded?' for main:ObjectError Loading File extrudeEdgesByFace.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByFaces.rb
undefined method file_loaded?' for main:ObjectError Loading File extrudeEdgesByLathe.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByLoft.rb
undefined method file_loaded?' for main:ObjectError Loading File extrudeEdgesByOffset.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByRails.rb
undefined method file_loaded?' for main:ObjectError Loading File extrudeEdgesByRailsByFace.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByRailsToLattice.rb
undefined method file_loaded?' for main:ObjectError Loading File extrudeEdgesByVector.rb undefined method
file_loaded?' for main:ObjectError Loading File extrudeEdgesByVectorToObject.rb
undefined method file_loaded?' for main:ObjectError Loading File faces.rb can't convert nil into StringError Loading File FredoTools.rb uninitialized constant FredoTools::T6Error Loading File FredoTools__ConstructFaceNormal.rb undefined method
register_plug' for FredoTools:ModuleError Loading File FredoTools__CountFacesBySides.rb
undefined method register_plug' for FredoTools:ModuleError Loading File FredoTools__CurviShear.rb undefined method
register_plug' for FredoTools:ModuleError Loading File FredoTools__MarkVertices.rb
undefined method register_plug' for FredoTools:ModuleError Loading File FredoTools__RemoveLonelyVertices.rb undefined method
register_plug' for FredoTools:ModuleError Loading File FredoTools__ReportLabelArea.rb
undefined method register_plug' for FredoTools:ModuleError Loading File FredoTools__ReverseOrientFaces.rb undefined method
register_plug' for FredoTools:ModuleError Loading File FredoTools__RevertCurve.rb
undefined method register_plug' for FredoTools:ModuleError Loading File FredoTools__ThruPaint.rb undefined method
register_plug' for FredoTools:ModuleError Loading File geom3d.rb
can't convert nil into StringError Loading File gizmo_manipulator.rb
can't convert nil into StringError Loading File gui.rb
can't convert nil into StringError Loading File image.rb
can't convert nil into StringError Loading File Image2Model.rb
undefined method file_loaded?' for main:ObjectError Loading File inputbox.rb can't convert nil into StringError Loading File instance.rb can't convert nil into StringError Loading File javascript.rb can't convert nil into StringError Loading File json.rb can't convert nil into StringError Loading File locale.rb can't convert nil into StringError Loading File materials.rb can't convert nil into StringError Loading File Mirror.rb undefined method
file_loaded?' for main:ObjectError Loading File modal_wrapper.rb
can't convert nil into StringError Loading File model.rb
can't convert nil into StringError Loading File point3d.rb
can't convert nil into StringError Loading File point3d_ex.rb
can't convert nil into StringError Loading File progressbar.rb
can't convert nil into StringError Loading File ray.rb
can't convert nil into StringError Loading File SectionCutFace.rb
undefined method file_loaded?' for main:ObjectError Loading File selection.rb can't convert nil into StringError Loading File settings.rb can't convert nil into StringError Loading File simpletask.rb can't convert nil into StringError Loading File system.rb can't convert nil into StringError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/TheaExporter_files/loader.rb undefined method
file_loaded?' for SU2TH:ModuleError Loading File TheaExporter_loader.rb
undefined method file_loaded?' for SU2TH:ModuleError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/TIG-Superdrape/TIG-Superdrape.rb undefined method
file_loaded?' for TIG:ModuleError Loading File TIG-Superdrape.rb
undefined method file_loaded?' for TIG:ModuleError Loading File toolbarwindow.rb can't convert nil into StringError Loading File toolwindow.rb can't convert nil into StringError Loading File tt_cleanup.rb can't convert nil into StringError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/TT_UV_Toolkit/loader.rb can't convert nil into StringError Loading File tt_uv_toolkit_2.rb undefined method
file_loaded' for main:ObjectError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/Utilities/utilitiesTools.rb
undefined method add_separator_to_menu' for main:ObjectError Loading File utilities.rb undefined method
add_separator_to_menu' for main:ObjectError Loading File uv_plane.rb
can't convert nil into StringError Loading File uvq.rb
can't convert nil into StringError Loading File version.rb
can't convert nil into StringError Loading File webdialog_patch.rb
undefined method is_osx?' for TT::System:ModuleError Loading File win32.rb can't convert nil into StringError Loading File window.rb can't convert nil into StringError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Tools/AdvancedCameraTools/actloader.rb undefined method
add_separator_to_menu' for FSCameraData:ModuleError Loading File advancedcameratools.rb
undefined method add_separator_to_menu' for FSCameraData:ModuleError Loading File /Library/Application Support/Google SketchUp 8/SketchUp/Tools/Sandbox/SandboxMenus.rb undefined method
add_separator_to_menu' for main:ObjectError Loading File sandboxtools.rb
undefined method `add_separator_to_menu' for main:Object