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iOS Build a Blog Reader iPhone App Adapting Data for Display Downloading and Displaying an Image

why is challenge 2 not accepting my answer?

I keep getting a 'data is not defined message' after submitting multiple variants of the following:

NSData *data = [NSData dataWithContentsOfURL:url];

'data' is defined. 'url' is defined, and the code inbetween is sound, so wtf? I've completed the blog reader and everything leading up to it with no problems, except for this one challenge.

thanks fellas

NSURL *url = [NSURL URLWithString:@"http://teamtreehouse.com/assets/homepage/logo.png"];

NSData *data = [NSData dataWithContentsOfURL:url];