Hi Team, I am trying to install and integrate Unzer payment module. I have installed , configured and integrated as per documentation. It is showing unzer gui in admin but in frontend (yves) after customer login getting this error. any help

The exception literaly tells you what the issue is and where to look at. It tries to find a OMS definition for Demo01.xml. So check

config/Zed/oms/Demo01.xml

. I assume you had a oms definition called Demo1.xml and deleted it. Two options here, if you deleted the Demo01.xml revert this deletion. Or check which order still points to this one (

<http://spy_sales_order_item.fk|spy_sales_order_item.fk>_oms_order_process

) and migrate those to use an existing state machine. If it's on your local machine you might even consider deleting the related order items and orders

Hi Alberto, I have already check for Demo.xml as exception showing it was not deleted it is there o same path. Let me confirm second option where it is pointing. Thanks for reply