Export/Import for OpenCart 2.x can't import

I am using this tool . I have an option image in the ProductOptionValues, I have copied code of the option quantity of ProductOptionValues for exporting and importing . but now , I could export all the data, but can't import the date and missing all the ProductOptionValues ,could u help me find what's the problem.

I only changed the code of this files: \admin\model\tool\export_import.php

What exact version do you want to export data and import data? Maybe the difference between two version cause the data missing.