String or binary data would be truncated when using it in a stored procedure

I create this TYPE table in database:

CREATE TYPE [dbo].[AccessLevel] AS TABLE
(
      [RoleId] [INT] NULL,
      [Access] [NVARCHAR](1) NULL,
      [IsDelete] [BIT] NULL
)
GO

and I need to insert data into it but when I use this code:

DECLARE @AccessLevel AccessLevel 

INSERT INTO @AccessLevel VALUES (4, 'dfdfg', 0)
INSERT INTO @AccessLevel VALUES (4, 'dfdfg', 0)

EXEC InsertAndUpdateAccessLevel @AccessLevel

and this is my stored procedure:

ALTER PROCEDURE [dbo].[InsertAndUpdateAccessLevel]
    (@AccessLevel AS AccessLevel READONLY)
AS
BEGIN
    INSERT INTO RoleAccess (RoleId, Access, IsDelete)
        SELECT * FROM @AccessLevel
END

I get this error:

Msg 8152, Level 16, State 4, Line 5
String or binary data would be truncated

What's the problem? How can I solve this problem?