I had the same problem. The plugin works great when I bend a simple shape, but when I try to bend a more complex shape I get the following error code:
Error: #<NoMethodError: undefined method all_connected' for nil:NilClass> C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/clf_shape_bender/clf_shape_bender.rb:364:in curve_picker'
C:/Program Files (x86)/Google/Google SketchUp
8/Plugins/clf_shape_bender/clf_shape_bender.rb:242:in `onLButtonUp'

The error comes up after I select the straight line. Then when I select the curved line it goes to 15% then splat!

I love the plugin, hope I can get it working.
Thanks!
GK