Creating a new grid field using ChannelField Model leads to exception error when field accessed about expressionengine

[jcogs-design]

FWIW - Seems that this code fragment will generate the correct exp_channel_grid_field_xx table... included here in case it is helpful for anyone else with this issue.

        // If grid_field created, now also generate a suitable data table
        if($field_type == 'grid') {
            ee()->load->model('grid_model');
            ee()->grid_model->create_field($field->field_id, 'channel');
            $column_data = array(
                'field_id' => $field->field_id,
                'content_type' => 'channel',
                'col_order' => 0,
                'col_type' => 'text',
                'col_label' => $field_label,
                'col_name' => $field_name,
                'col_instructions' => '',
                'col_required' => 'n',
                'col_search' => 'n',
                'col_width' => 0,
                'col_settings' => '{"field_maxl":"256","field_fmt":"none","field_text_direction":"ltr","field_content_type":"all","field_required":"n"}'
            );
            ee()->grid_model->save_col_settings($column_data, '', 'channel');
        }