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copied!<p>I know this is from several months ago, but I just had the same problem and it was painful so I thought I'd share. I solved it by adding this line:</p> <pre><code>[self.keychainItemWrapper setObject:@"MY_APP_CREDENTIALS" forKey:(id)kSecAttrService]; //@"MY_APP_CREDENTIALS" can be any string. </code></pre> <p>I found this blog entry very helpful: "In database terms you could think of their being a unique index on the two attributes kSecAttrAccount, kSecAttrService requiring the combination of those two attributes to be unique for each entry in the keychain." (from <a href="http://useyourloaf.com/blog/2010/4/28/keychain-duplicate-item-when-adding-password.html" rel="noreferrer">http://useyourloaf.com/blog/2010/4/28/keychain-duplicate-item-when-adding-password.html</a>).</p> <p>Also, in Apple's example project using this code, they instantiate KeychainItemWrapper in the app delegate. I don't know if it's necessary, but I like to follow their examples as closely as possible:</p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ //there will be some standard code here. KeychainItemWrapper *wrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"MY_APP_CREDENTIALS" accessGroup:nil]; self.keychainWrapper = wrapper; [self.keychainWrapper setObject:@"MYOBJECT" forKey:(id)kSecAttrService]; [wrapper release]; } </code></pre> <p>I think this is a bug in the wrapper code. The logic basically says "Does this entry exist already? No, it doesn't. OK, I'll add it. Oops, you can't add it because it's already there."</p> <p>You may also need to set kSecAttrAccount; I've never tried it without also setting this value since it's intended to save the username that goes with the password:</p> <pre><code>[self.wrapper setObject:txtUserName.text forKey:(id)kSecAttrAccount]; </code></pre>

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