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Error: Xtento/.../Test/SerializedToJsonDataConverter does not exist

Potential error messages:

  • Error Xtento\OrderExport\Test\SerializedToJsonDataConverter does not exist
  • Error Xtento\ProductExport\Test\SerializedToJsonDataConverter does not exist
  • Error Xtento\OrderImport\Test\SerializedToJsonDataConverter does not exist
  • Error Xtento\StockImport\Test\SerializedToJsonDataConverter does not exist
  • Error Xtento\TrackingImport\Test\SerializedToJsonDataConverter does not exist

Step 1: Reinstall module, verify all files are there. Make sure the "Test" folder located in the module directory hasn't been deleted.
Step 2: Still an issue? It's your deployment process probably that removes the "Test" folder, thinking it's not required. We are aware of "magento2-deployer-plus" doing this for example.

The "Test" folder is required by the extension for reasons of compatibility with Magento Marketplace unfortunately.