Help with crawling through gdata json start-index

I have been trying to implement feeds_crawler with my youtube_importer_feature as mentioned by mitchell here.

I cant for the life of me get it to work though, the best I can get is that it imports all the items on the original URL (for example):

http://gdata.youtube.com/feeds/api/users/gordonramsay/uploads?v=2&alt=jsonc&max-results=50

Then spits out an error:

Notice: Undefined index: url_pattern in fetch() (line 47 of /home/quickstart/websites/dev.dev/sites/all/modules/feeds_crawler/FeedsCrawler.inc). => 

I am putting in the original URL then in the crawler section using:

http://gdata.youtube.com/feeds/api/users/gordonramsay/uploads?v=2&alt=jsonc&max-results=50&start-index=$index

for the URL pattern, initial index 1 and increment by 50. Where am I going wrong?