I removed all my scripts other than city_gen.rb and put in all those of city_gen.rb and related.
I get this error when launching SU7.1
Error Loading File street_gen.rb
undefined method `file_loaded?' for main:Object
Ah. This is probably why.
Modules to CityGen, such as StreetGen, should be located under the module folder you find the the CityGen folder.
It is mentioned in the instructions, but I know it's not necessarily obvious. On the StreetGen page it's mentioned in the small prints under the download. On the CityGen page is described under "Core and Installation Check".
This whole project is very much work in progress (except that there has been little progress the last year) - so all our instructions are not that obvious to follow. We where talking about installers, but the project fell down from out priorities before we got to that point.
So, what I think you need to do is remove all the CityGen and StreetGen files you added to your plugins folder.
Then see if your other plugins work.
If they do work, then first install CityGen core
Then install StreetGen to the modules folder of CityGen.
Thomas Thomassen — SketchUp Monkey & Coding addict
List of my plugins and link to the CookieWare fund