Invalid Operation due to current state of object

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VB

I am getting an error: Invalid operation due to current state of object when executing following piece of code:

dim cmd as oracleCommand= New oraclecommand("Select * from table1")
dim dr as oracleDataReader = cmd.ExecuteReader()

Error generate on the line Cmd.ExecuteReader()

For ConnectionString i used the following constructor:

Public Sub New(ByVal m_conERP As Oracle.DataAccess.Client.OracleConnection, _
   ByVal m_objUser As ERPCommon.User, ByVal m_selectedMenu As ERPCommon.User.Menu)
       Me.New()
       Try
           conERP = m_conERP
           objUser = m_objUser
           selectedMenu = m_selectedMenu
           'StartUp()
       Catch ex As Exception
       End Try
   End Sub