Can't install on Mac. Error Loading File sketchyphysics.rb undefined method `selection' for nil:NilClass

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Download SketchyPhysics 3.2 Mac zip (Dec 2 2010)
2. Unzip file
3. Copy contents (Two .rb files, One .so file, and one SketchyPhysics3 folder) 
to the Library/Application Support/Google SketchUp 6/Sketchup/Plugins folder

What is the expected output? What do you see instead?
When I launch Sketchup 6, I get the error:

Error Loading File sketchyphysics.rb
undefined method `selection' for nil:NilClass

What version of the product are you using? On what operating system?
Sketchup 6 on MAC OS X Lion

Please provide any additional information below.

Original issue reported on code.google.com by basil.ho...@gmail.com on 1 Sep 2011 at 11:55

[GoogleCodeExporter]

Hello,

All my tools windows are there but completely empty and I get this error 
message:

---
Error Loading File ChildFrame.rb
uninitialized constant WxError Loading File downloader.rb
no such file to load -- net/httpError Loading File downloader1.rb
no such file to load -- socketError Loading File input.rb
no such file to load -- sketchyphysics3/virtualkeycodes.rbError Loading File 
JointTool.rb
can't convert nil into StringError Loading File midi.rb
can't convert nil into StringError Loading File Newton.rb
can't find the symbol `init'Error Loading File PrimsTool.rb
can't convert nil into StringError Loading File sketchyphysics.rb
no such file to load -- SketchyPhysics3/ClassExtensions.rbError Loading File 
SketchyPhysicsTool.rb
can't convert nil into StringError Loading File SketchyReplay.rb
can't convert nil into StringError Loading File Sound.rb
can't find the symbol `SDL_Init'Error Loading File SP_midi.rb
NoMIDIDestinations
---

Best
G

Original comment by gregory....@gmail.com on 29 Oct 2011 at 2:37

[GoogleCodeExporter]

Error Loading File sketchyphysics.rb

Original comment by hamid200...@gmail.com on 23 Dec 2012 at 9:03