I had copied the full example directory. After copying, I had replaced schema.xml from my old 3.5 schema.xml and I faced this error. After Eric's email, I copied stopwords_en.txt into conf directory of my copy. It works fine after that.
After seeing your email, it seems that the better approach would be to add lang/ infront of the stopwords_en references in my copied schema.xml because lang/ did not exist in the 3.5 directories. Regards Sohail
