role provider and membership provider

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C#

Visual-Studio

MVC

MVC3

Hi.
I was customized membership provider.after that default role provider not work properly.
for example when i want to add user to role following error occurred:
the user "x" not found.
my user table schema:

CREATE TABLE [dbo].[Users](
    [UserID] [uniqueidentifier] NOT NULL,
    [ApplicationName] [nvarchar](max) NULL,
    [ApplicationId] [uniqueidentifier] NOT NULL,
    [IsAnonymous] [bit] NOT NULL,
    [LastActivityDate] [datetime] NOT NULL,
    [Tenant] [nvarchar](50) NOT NULL,
    [Username] [nvarchar](100) NOT NULL,
    [Email] [nvarchar](100) NOT NULL,
    [Created] [datetime] NOT NULL,
    [LastUpdated] [datetime] NOT NULL,
    [PasswordChanged] [datetime] NOT NULL,
    [RequiresPasswordReset] [bit] NOT NULL,
    [MobileCode] [nvarchar](max) NULL,
    [MobileCodeSent] [datetime] NULL,
    [MobilePhoneNumber] [nvarchar](max) NULL,
    [AccountTwoFactorAuthMode] [int] NOT NULL,
    [CurrentTwoFactorAuthStatus] [int] NOT NULL,
    [IsAccountVerified] [bit] NOT NULL,
    [IsLoginAllowed] [bit] NOT NULL,
    [IsAccountClosed] [bit] NOT NULL,
    [AccountClosed] [datetime] NULL,
    [LastLogin] [datetime] NULL,
    [LastFailedLogin] [datetime] NULL,
    [FailedLoginCount] [int] NOT NULL,
    [VerificationKey] [nvarchar](100) NULL,
    [VerificationPurpose] [int] NULL,
    [VerificationKeySent] [datetime] NULL,
    [HashedPassword] [nvarchar](200) NOT NULL

help please.