Column name must be either a string or an array.

[RootRifs]

This Error is on Step 3 Atributes.

[UberthemeTeam]

Hi @RobertOtto77 ,

It's pity that our old script here on Github is outdated and has been replaced with a newer version - UB Data Migration Pro, which is fully compatible with the latest Magento 2.2.0.

Many users have been using our Pro version to port their M1 data to M2 successfully, a few to name like here and here. We highly recommend you take a look at our Pro version, it will save you tons of time.

Regards,
Ubertheme team

[ashvinim0003]

@RobertOtto77 kindly share more information.