This is Windows 7 with python 2.7
I have a scrapy project in a directory called caps (this is where scrapy.cfg is)
My spider is located in caps\\caps\\spiders\\c
Try running scrapy list on the command line. If there is any error on the spider it will detect it.
scrapy list
In my case, I was bluntly copy code from another project and forget to change the project name from the spider module import