Error description

I'm trying to import a Part list from CSV with stock levels with the settings can be seen on the following screenshots.

When I click on the Export button, the following error appears in the log: [2017-08-03 14:04:23] request.CRITICAL: Uncaught PHP Exception Exception: "The key importBehaviour does not exist!" at /var/www/html/PartKeepr/src/PartKeepr/ImportBundle/Configuration/EntityConfiguration.php line 31 {"exception":"[object] (Exception(code: 0): The key importBehaviour does not exist! at /var/www/html/PartKeepr/src/PartKeepr/ImportBundle/Configuration/EntityConfiguration.php:31)"} []

I start importing operation on Root Category If I try to leave the stock information import, the error is the same.

System Information