'NSUnknownKeyException', reason: '[<ViewController 0x7f838056d7a0> setValue:forUndefinedKey:]

[tammarat]

I have followed this tutorial: https://github.com/ShinobiControls/iOS7-day-by-day/blob/master/15-core-image-filters/15-core-image-filters.md in the section of QR CODE Generation.

After I clicked run, the program open and I can see the welcome image of an app and then it stop there.

on the IDE coding section, it direct me to the main.m and highlight on a line of code which is " return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));" and says Thread 1:signal SIGABRT

on the LOG section it says this "2014-11-03 11:30:01.172 qrcode[957:24207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ViewController 0x7fc652cb9cc0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key outputImageView.'"

how can I fix this please help me. t-t

[sammyd]

This looks like you haven't created an IBOutlet on your View Controller. The code is trying to set the image property on outputImageView (which is accessed through KVC), but since an outlet either doesn't exist, or isn't connected up, then it isn't managing to do this.

[tammarat]

thank you very much ^^