They are from different sites and the websites have not changed. As I mentioned before, one minute I was able to create a new crawler and extract data and within 15-20 minutes of that, it stopped working.
I just recreated a crawler and again, the error message was - Unfortunately, your URLs didn’t return any data - with the same urls that I used for its creation. Maybe I am missing the obvious restriction for a free user but then the error message should be different.
Before someone has a look, do I need to mention any details(id etc)? Thanks.