C# 错误：无法在Azure Mobile Services上完成请求（内部服务器错误）

我正在构建一个Windows 8.1 Metro应用程序，该应用程序连接到Azure上托管的服务器后端。现在，为了进行测试，当我点击应用程序屏幕上的按钮时，它会触发一个函数，向数据库中插入一个值

代码如下：

private async void SubmitClick(object sender, RoutedEventArgs e)
    {
      Companies Quiblify = new Companies {Name = "CompanyX"};
      await App.MobileService.GetTable<Companies>().InsertAsync(Quiblify);
    }
}

我有什么问题

编辑：这是服务器端代码

// POST tables/Companies
public async Task<IHttpActionResult> PostCompany(Companies item)
{
    Companies current = await InsertAsync(item);
     return CreatedAtRoute("Tables", new { id = current.Id }, current);
}

//发布表格/公司
公共异步任务邮政公司（公司项目）
{
当前公司=等待插入同步（项目）；
返回CreatedAtRoute（“Tables”，new{id=current.id}，current）；
}

以下是错误日志：

Exception=System.Data.SqlClient.SqlException (0x80131904): Cannot open database "master" requested by the login. The login failed.
Login failed for user 'dNDCkODBwDLogin_ModernPOSBackend'.
This session has been assigned a tracing ID of 'bafdb889-b1b9-42a1-ace5-101ed382c1d2'.  Provide this tracing ID to customer support when you need assistance.
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<Open>b__36(DbConnection t, DbConnectionInterceptionContext c)
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext](TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
   at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext)
   at System.Data.Entity.SqlServer.SqlProviderServices.<>c__DisplayClass34.<UsingConnection>b__32()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable`1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript)
   at System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase()
   at System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection)
   at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext)
   at System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState)
   at System.Data.Entity.Database.Create(DatabaseExistenceState existenceState)
   at System.Data.Entity.DropCreateDatabaseIfModelChanges`1.InitializeDatabase(TContext context)
   at System.Data.Entity.Internal.InternalContext.<>c__DisplayClassf`1.<CreateInitializationAction>b__e()
   at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
   at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
   at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c)
   at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
   at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
   at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
   at System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)
   at System.Data.Entity.DbSet`1.Add(TEntity entity)
   at Microsoft.WindowsAzure.Mobile.Service.EntityDomainManager`1.<InsertAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.WindowsAzure.Mobile.Service.TableController`1.<InsertAsync>d__3.MoveNext()
ClientConnectionId:8edddc79-b06c-4c06-8cd2-aedc688e2c99
Error Number:4060,State:1,Class:11, Id=d3a27e91-15b5-4cd3-a8a5-761434cc363b, Category='App.Controllers.Tables'

Exception=System.Data.SqlClient.SqlException（0x80131904）：无法打开登录请求的数据库“master”。登录失败。
用户“dNDCkODBwDLogin_ModernPostBackend”登录失败。
已为该会话分配了一个跟踪ID“bafdb889-b1b9-42a1-ace5-101ed382c1d2”。当您需要帮助时，请向客户支持提供此跟踪ID。
位于System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject、UInt32 waitForMultipleObjectsTimeout、Boolean allowCreate、Boolean OnlyOnEckConnection、DbConnectionOptions userOptions、DbConnectionInternal和connection）
位于System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject、TaskCompletionSource`1重试、DbConnectionOptions用户选项、DbConnectionInternal和connection）
位于System.Data.ProviderBase.DbConnectionFactory.TryGetConnection（DbConnection owningConnection、TaskCompletionSource`1重试、DbConnectionOptions用户选项、DbConnectionInternal oldConnection、DbConnectionInternal&connection）
位于System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（DbConnection outerConnection、DbConnectionFactory connectionFactory、TaskCompletionSource`1重试，DbConnectionOptions用户选项）
位于System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection（DbConnection outerConnection、DbConnectionFactory connectionFactory、TaskCompletionSource`1重试、DbConnectionOptions用户选项）
位于System.Data.SqlClient.SqlConnection.TryOpenInner（TaskCompletionSource`1重试）
位于System.Data.SqlClient.SqlConnection.TryOpen（TaskCompletionSource`1重试）
在System.Data.SqlClient.SqlConnection.Open（）处
在System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.b_u36（DbConnection t，DbConnectionInterceptionContext c）
在System.Data.Entity.Infrastructure.InternalDispatcher`1.Dispatch[TTarget，TInterceptionContext]（TTarget，Action`2 operation，TInterceptionContext interceptionContext，Action`3 executing，Action`3 executed）
位于System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open（DbConnection连接，DbInterceptionContext interceptionContext）
位于System.Data.Entity.SqlServer.SqlProviderServices.c__DisplayClass34.b__u32（）
在System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.c__DisplayClass1.b__0（）中
在System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult]（Func`1操作）中
位于System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute（操作操作）
位于System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection（DbConnection-sqlConnection，Action`1-act）
位于System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection（DbConnection-sqlConnection，Action`1-act）
位于System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript（可为null的`1 commandTimeout、DbConnection sqlConnection、String createDatabaseScript）
位于System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase（DbConnection连接，Nullable`1 commandTimeout，StoreItemCollection StoreItemCollection）
位于System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase（DbConnection连接，Nullable`1 commandTimeout，StoreItemCollection StoreItemCollection）
位于System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase（）处
位于System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create（数据库连接）
位于System.Data.Entity.Migrations.Dbmigator.EnsureDatabaseExists（操作必须成功才能访问数据库）
位于System.Data.Entity.Migrations.DbMigrator.Update（字符串targetMigration）
位于System.Data.Entity.Internal.DatabaseCreator.CreateDatabase（InternalContext InternalContext，Func`3 createMigrator，ObjectContext ObjectContext）
位于System.Data.Entity.Internal.InternalContext.CreateDatabase（ObjectContext ObjectContext，DatabaseExistenceEstate ExistenceEstate）
位于System.Data.Entity.Database.Create（DatabaseExistenceEstate）
位于System.Data.Entity.DropCreateDatabaseIfModelChanges`1.InitializeDatabase（TContext上下文）
在System.Data.Entity.Internal.InternalContext.c__DisplayClassf`1.b__e（）中
位于System.Data.Entity.Internal.InternalContext.PerforminizationAction（操作操作）
位于System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization（）处
位于System.Data.Entity.Internal.LazyInternalContext.b_uu4（InternalContext c）
在System.Data.Entity.Internal.RetryAction`1.PerformAction（输入）
位于System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction（Action`1 Action）
在System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase（）中
位于System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType（类型entityType）
位于System.Data.Entity.Internal.Linq.InternalSet`1.Initialize（）
位于System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext（）
位于System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet（操作操作，EntityState新闻状态，对象实体，字符串方法名）
位于System.Data.Entity.Internal.Linq.InternalSet`1.Add（对象实体）
at System.Data.Entity.DbSet`1.Add（TEntity实体）
在Microsoft.WindowsAzure.Mobile.Service.EntityDomainManager`1.d\u 0.MoveNext（）上
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（T
Exception=System.Data.SqlClient.SqlException (0x80131904): Cannot open database "master" requested by the login. The login failed.
Login failed for user 'dNDCkODBwDLogin_ModernPOSBackend'.
This session has been assigned a tracing ID of 'bafdb889-b1b9-42a1-ace5-101ed382c1d2'.  Provide this tracing ID to customer support when you need assistance.
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<Open>b__36(DbConnection t, DbConnectionInterceptionContext c)
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext](TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
   at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext)
   at System.Data.Entity.SqlServer.SqlProviderServices.<>c__DisplayClass34.<UsingConnection>b__32()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action`1 act)
   at System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable`1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript)
   at System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection)
   at System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase()
   at System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection)
   at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext)
   at System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState)
   at System.Data.Entity.Database.Create(DatabaseExistenceState existenceState)
   at System.Data.Entity.DropCreateDatabaseIfModelChanges`1.InitializeDatabase(TContext context)
   at System.Data.Entity.Internal.InternalContext.<>c__DisplayClassf`1.<CreateInitializationAction>b__e()
   at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
   at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
   at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c)
   at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
   at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
   at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
   at System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)
   at System.Data.Entity.DbSet`1.Add(TEntity entity)
   at Microsoft.WindowsAzure.Mobile.Service.EntityDomainManager`1.<InsertAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.WindowsAzure.Mobile.Service.TableController`1.<InsertAsync>d__3.MoveNext()
ClientConnectionId:8edddc79-b06c-4c06-8cd2-aedc688e2c99
Error Number:4060,State:1,Class:11, Id=d3a27e91-15b5-4cd3-a8a5-761434cc363b, Category='App.Controllers.Tables'