Azure MobileApp : InvokeApiAsync failing with InvalidOperationException - azure

Question

I am trying out the Azure Mobile app and the recently released SDKs
https://azure.microsoft.com/en-us/blog/azure-mobile-apps-november-2015-update/
I created the service and the starter Todo app was working fine. I then added facebook authentication and that worked too. I also wanted to get some additional FB info from the service , so based on a solution and the sample app on github , I added a new api
https://github.com/Azure/azure-mobile-apps-net-server/blob/2d2901ed5207f0ba6698660eb4ee568a63f18581/samples/SampleApp/Controllers/SecuredController.cs
Server side code
public class AuthenticationController : ApiController
{
[Authorize]
public async Task<JObject> GetIdentity()
{
FacebookCredentials fb = await this.User.GetAppServiceIdentityAsync<FacebookCredentials>(this.Request);
var result = new JObject();
if (fb != null)
{
var accessToken = fb.AccessToken;
result.Add("facebook", await GetProviderInfo("https://graph.facebook.com/me?access_token=" + accessToken));
}
return result;
}
private async Task<JToken> GetProviderInfo(string url)
{
var c = new HttpClient();
var resp = await c.GetAsync(url);
resp.EnsureSuccessStatusCode();
return JToken.Parse(await resp.Content.ReadAsStringAsync());
}
}
Client Side Code in Android project
var user = await TodoItemManager.Instance.ClientInstance.LoginAsync(Forms.Context, MobileServiceAuthenticationProvider.Facebook);
var info = await TodoItemManager.Instance.ClientInstance.InvokeApiAsync("GetIdentity", null, HttpMethod.Get, null);
The LoginAsync succeeds and I get the UserId and Token, but InvokeApiAsync fails with following exception
Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException: The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<ThrowInvalidResponse>d__18.MoveNext () [0x0022f] in <filename unknown>:0
--- End of stack trace from previous location where exception was thrown ---
11-26 19:09:10.897 I/mono-stdout( 3514): at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<ThrowInvalidResponse>d__18.MoveNext () [0x0022f] in <filename unknown>:0
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:201
11-26 19:09:10.898 I/mono-stdout( 3514): --- End of stack trace from previous location where exception was thrown ---
11-26 19:09:10.898 I/mono-stdout( 3514): at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:170
11-26 19:09:10.899 I/mono-stdout( 3514): at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:201
11-26 19:09:10.900 I/mono-stdout( 3514): at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:170
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:142
at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:124
at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<SendRequestAsync>d__1d.MoveNext () [0x0010d] in <filename unknown>:0
What am I missing or doing wrong?
Thanks in advance..

Answer 1

I had a similar error in my project, using the new Azure App Service sample projects. I was simply trying to retrieve data from an Azure db using my own model classes, not doing authentication like you.
Here's the error:
Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException:
The resource you are looking for has been removed, had its name
changed, or is temporarily unavailable.
Turns out, in my mobile server project, I had a model defined as CorporateEvent, and in my client project, I had the same model defined as CorporateEventModel. Once I renamed the model in my client project to CorporateEvent, the error went away and I was able to access the database.
Hope that helps.