SqlServer 2008 no conecta con DBX

[Paulao]

Hizo un archivo .INI para conecion con Banco de Datos Sql Server 2008. El problema que quando voy abrir mi ClientDataSet me lo da un error asi:

Código Delphi [-]
SQLConection property required for this operation

Que puede ser esto? Abajo mi conecion:

Código Delphi [-]
if banco = 'SqlServer' then
  begin
    SqlConnection1.ConnectionName                        := 'MSSQLConnection';
    SqlConnection1.DriverName                            := 'MSSQL';
    SqlConnection1.GetDriverFunc                         := 'getSQLDriverMSSQL';
    SqlConnection1.LibraryName                           := 'dbexpmss.dll';
    SqlConnection1.LoginPrompt                           := False;
    SqlConnection1.VendorLib                             := 'OleDb';
    SqlConnection1.Params.Values['DriverName']           := arq_conexao.ReadString('SqlServer','DriverName','');
    SqlConnection1.Params.Values['HostName']             := arq_conexao.ReadString('SqlServer','HostName','');
    SqlConnection1.Params.Values['DataBase']             := arq_conexao.ReadString('SqlServer','DataBase','');
    SqlConnection1.Params.Values['User_Name']            := arq_conexao.ReadString('SqlServer','User_Name','');
    SqlConnection1.Params.Values['Password']             := arq_conexao.ReadString('SqlServer','password','');
    SqlConnection1.Params.Values['BlobSize']             :=  arq_conexao.ReadString('SqlServer','BlobSize','');
    SqlConnection1.Params.Values['LocaleCode']           :=  arq_conexao.ReadString('SqlServer','LocaleCode','');
    SqlConnection1.Params.Values['ErrorResourceFile']    :=  arq_conexao.ReadString('SqlServer','ErrorResourceFile','');
    SqlConnection1.Params.Values['MSSQL TransIsolation'] :=  arq_conexao.ReadString('SqlServer','MSSQL TransIsolation','');
    SqlConnection1.Params.Values['OS Authentication']    :=  arq_conexao.ReadString('SqlServer','OS Authentication','');
  end;