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Hi, 

je tried to add a print button in version 8 to print ticket by importing ESC/ POs but this erreur message was appear 

Impossible d'installer le module "hw_escpos" une cause d'une dépendance externe non trouvée: aucun module nommé usb.core
so how can i add print button ?

thunnks

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Best Answer

could you try what was proposed here?

https://www.odoo.com/fr_FR/forum/aide-1/question/no-module-named-usb-core-61224

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