Problem: The client was unable to translate attributes in WooCommerce Multilingual & Multicurrency. Despite setting the taxonomy language to Dutch, the translation pencil icon was unresponsive, and an E_ERROR was encountered in the WPML plugin files. Solution: We recommended checking the documentation on translating and synchronizing global attributes in WooCommerce Multilingual, available here: https://wpml.org/documentation/related-projects/woocommerce-multilingual/#translate-and-synchronize-global-attributes.
The client resolved the issue by switching the "copy taxonomies to translation" on and off. Set all taxonomies to Dutch (because they were somehow registered as English). Then the client sent all products for translation (automatic > publish without review) and selected the already translated content to "Overwrite existing translations". After that, navigate to the Taxonomies translation and select the taxonomies one at a time and press the sync button at the bottom.
If this solution does not resolve your issue or seems outdated, please visit our known issues page at https://wpml.org/known-issues/ to check for any updates or related problems. We also recommend confirming that you have the latest versions of themes and plugins installed. If problems persist, do not hesitate to open a new support ticket for further assistance.