First off - remove the Roof RB file/subfolder [or RBZ ?] from Tools. and install it correctly.
Get the latest RBZ from the PluginStore - it's at v4.0:
https://sketchucation.com/pluginstore?pln=Roof
Thread is here:
http://sketchucation.com/forums/viewtopic.php?p=17156#p17156
It's linked in the big pink block in this old thread's first post...
The latest RBZ archive needs to be installed using Window > Preferences > Extensions > Install Extension [gray-button].
Note that in v2017 this installer-button has moved into Window > Extension Manager, and is 'red'.
The contents of the RBZ are then extracted into your User Plugins folder.
For several versions of SketchUp this has NOT been in the main SketchUp folder within Program Files - you should never need to change or add anything as it's reserved and has restricted permissions too.
The User Plugins folder is now in your User's AppData folder-path.
It's hidden by default, as you rarely need to manually change it.
You can see it by changing the Windows Explorer 'Folder Options'...
Copy/Paste this + enter in the Window > Ruby Console, it opens your Plugins folder for you...
UI.openURL("file:///#{Sketchup.find_support_file("Plugins")}")
the path will be:
C:/Users/YOURWINDOWSUSERNAME/AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins
