Getting error "Record not found" for articles list view, although the articles there.

[deepa-g]

I'm trying to using Articles Plugin but when I using the resource "article" with this structure
host_name/index.php?option=com_api&app=articles&resource=article&format=raw&key=d5d2e3fa64391f11b57a2d16ad67da33
getting error "Record not found". But on site no. of articles are present.