<https://lh4.googleusercontent.com/-7SEcb7ZaZ3k/UH5fkTHcGoI/AAAAAAAAAA...>
When I use oauth2 to login, first I got the page:

<https://lh6.googleusercontent.com/-dJ-I7kFW2DI/UH5gA_D4EtI/AAAAAAAAAA...>
After i login ,I got the page:

<https://lh6.googleusercontent.com/-JDbQFs_AyZo/UH5gOtdpSOI/AAAAAAAAAA...>
the I cliked "allow access ", and got:

<https://lh4.googleusercontent.com/-DwoP3hsCkdY/UH5gdEmd7CI/AAAAAAAAAA...>
finally, cliking "here" make it:

How to solve this error.
Could anyone help me? thanks.

Thanks for posting the images. I have passed them on to the server
engineers for investigation.

Can you confirm that Javascript is enabled for the webview?

Be sure that DEBUG is defined to 1 in your development builds, to enable
the assert that checks for Javascript support. (See webViewDidFinishLoad:
in  GTMOAuth2ViewControllerTouch)

webViewDidFinishLoad is:

- (void)webViewDidFinishLoad:(UIWebView *)webView {

  [self notifyWithName:kGTMOAuth2WebViewStoppedLoading

               webView:webView

                  kind:kGTMOAuth2WebViewFinished];

  NSString *title = [webView stringByEvaluatingJavaScriptFromString:
@"document.title"];

  if ([title length] > 0) {

    [signIn_ titleChanged:title];

  } else {

#if DEBUG

    // Verify that Javascript is enabled

    NSString *result = [webView stringByEvaluatingJavaScriptFromString:
@"1+1"];

    NSAssert([result integerValue] == 2, @"GTMOAuth2: Javascript is
required");

#endif

  }

  if (self.request && [self.initialHTMLString length] > 0) {

    // The request was pending.

    [self setInitialHTMLString:nil];

    [self.webView loadRequest:self.request];

  } else {

    [signIn_ cookiesChanged:[NSHTTPCookieStorage sharedHTTPCookieStorage]];

    [self updateUI];

  }

I write " #define DEBUG 1" at the beginning
of GTMOAuth2ViewControllerTouch.m, but it did not works, the same error
occured.

*I init viewController like this:*

viewController = [[GTMOAuth2ViewControllerTouch controllerWithScope:scope

                                                              clientID
:clientID

                                                          clientSecret
:clientSecret

                                                      keychainItemName:
kKeychainItemName

                                                              delegate:self

                                                      finishedSelector
:finishedSel]autorelease];
*Then push it :*
    [self dismissViewControllerAnimated:YES completion:nil];

    [self presentViewController:viewController animated:YES completion:nil];

but the error I said before occured, and the finishedSelector have not
executed;

The server team can reproduce the problem on clients where Javascript is
disabled, so be sure that is not the case for the controller's webview in
your app. That problem will be addressed by the server team.

It works well when I use another mac to run my project. I think it was the
simulator that made the error.
I have another question that , when I used the client ID registered as
"installed application" -> IOS, error "invalid_client" occur, but when I
changed it to  "installed application" -> other, It works well.

The API Console's registration incorrectly labels client ID registration as
"iOS" when that's only for clients using the Google+ SDK.

See
http://code.google.com/p/gtm-oauth2/wiki/Introduction#Registering_You...

Greg,

Our QA team at Quickoffice is reporting this same problem.  It seems to
occur on the first run of the product only on iOS 5 devices.  Subsequent
attempts to login work fine.  Is there a fix in the works?