@tig said:

The error tells you the line and the file...
Error: #<NoMethodError: undefined methodtransformation' for #Sketchup::Face:0x00000007b21748>
C:/Users/tcw/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/engineeringtoolbox_tools/engineeringtoolbox.rb:26:in eval'
Line 26 in engineeringtoolbox.rb
A Face does not have a transformation.
So I suspect that the code [I don't have it at hand] for '4x3 Concentric Reducer' is expecting you to have selected something that does have a transformation - like a group, component_instance etc...
Have you read the usage instructions ?
http://sketchup.engineeringtoolbox.com/concentric-eccentric-reducers-to_28.html

TIG,

Your clear explanation provided the direction needed. I actually had read through the instructions which is why I drew a circle on the floor and selected its face to place the new component on the floor. Guided by your answer, I made the circle a group and the component insertion worked as expected.

Thanks,
AustinPowered

I installed Engineering Toolbox through the Extension Warehouse which warned me about expired digital signatures but then reported the extension was ready to go.

After restarting SU, I loaded my drawing and opened the Ruby console. I selected a circle drawn on the floor, opened the toolbox from within SU and browsed to a 4x3 Concentric Reducer and clicked 'Insert'.

See below for the error message displayed in the console.

Error: #<NoMethodError: undefined method transformation' for #<Sketchup::Face:0x00000007b21748>> C:/Users/tcw/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/engineeringtoolbox_tools/engineeringtoolbox.rb:26:in eval'
C:/Users/tcw/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/engineeringtoolbox_tools/engineeringtoolbox.rb:26:in eval' C:/Users/tcw/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/engineeringtoolbox_tools/engineeringtoolbox.rb:26:in block in create_dialog'
SketchUp:1:in `call'

This statement is found in engineeringtoolbox.rb
require 'sketchup.rb'

And this statement is found in engineeringtoolbox_tools.rb
require 'extensions.rb'
require 'sketchup.rb'

Both of these files are found in C:\Program Files\SketchUp\SketchUp 2016\Tools

SU Make 2016
Win7 64-bit
Chrome Browser but IE is installed

What else can I tell you to track down what I suspect is a configuration error?

Thanks,
AustinPowered