500 internal server error when using the web interface

Question

I've created several tables in Visual Studio, and I'm using a .NET backend for my mobile services.
The table code looks something like this...
using Microsoft.WindowsAzure.Mobile.Service;
namespace AzureService.DataObjects
public class Country : EntityData
public string Name { get; set; }
I then added a scaffolded item to generate the controller for my table, then published.
I then went to my azure service, flipthechipservice.azure-mobile.net, and tried to run the default POST with default data.
I then get back a popup, which looks like the following...
Now what baffles me is I have already created another table, called 'Call', which has exactly the same 'Name' field as the above Country table, yet the Call POSTs work.
I then tried creating another table, with a Name field, and I get the 500 error again. 
How can this be possibly happening? Nothing is different, and now I get 500 errors? 
This makes no sense.
Thanks

Answer 1

Thank you, I looked at the logs, and this is the error...
System.NotSupportedException: Model compatibility cannot be checked because the database does not contain model metadata. Model compatibility can only be checked for databases created using Code First or Code First Migrations.
 at System.Data.Entity.Internal.ModelCompatibilityChecker.CompatibleWithMode
I looked this error up, and tried
this proposed solution on StackOverFlow
I changed the line of code in my WebApiConfig Register() method from...
Database.SetInitializer(new MobileServiceInitializer());
to 
Database.SetInitializer<MobileServiceContext>(new DropCreateDatabaseIfModelChanges<MobileServiceContext>());
I also have this in my WebApiConfig...
public class MobileServiceInitializer : DropCreateDatabaseIfModelChanges<MobileServiceContext>
protected override void Seed(MobileServiceContext context)
base.Seed(context);
My understanding is that the database should drop and create if the model changes? So why is this not happening?
I then tried another solution, and changed DropCreateDatabaseIfModelChanges to DropCreateDatabaseAlways. I still get an internal error. Then the logs show this problem...
System.Data.SqlClient.SqlException (0x80131904): Cannot open database "master" requested by the login. The login failed.
 Login failed for user 'QEOzFqAnDXLogin_flipthechipservice'.
 This session has been assigned a tracing ID of 'a3b12e78-90f2-4db0-a5ca-6895eebd246c'. Provide this tracing ID to customer support when you need assistance.
 at System.Data.SqlClient.SqlInternalConnection.OnError
As an additional question, how do I re-generate my local SQL database when debugging on my local PC's web browser? I deleted the database, but can't seem to get it back?
Thanks