v1.0.6: How to fix the validation error on M2.2.6?

QUESTION:

I installed module v1.0.6 for my site Magento 2.2.6. 

Exporting the categories to a file csv is fine, however, when I use this exporting file CSV to import, we have validation issues: "Sorry, but the data is invalid or the file is not uploaded".

How to fix it?

ANSWER:

This error happened since the file separator is missing in M2.2.6.

To fix the error, please edit file app/code/Bss/CategoriesImportExport/Model/Source/Import/Behavior/Category.php as below:

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