I solved ! Troubled line is this : examples.append(data.Example.fromlist([None, label, None, rawtext], fields))
My csv file includes 4 column, but I gave just 2 column id (['rawtext', 'label']). However it should be like that: [None, label, None, rawtext] (order is important).
You can create your list in TabularDataset_From_List Class’s init function and create TabularDataset with your list.