Checkout is broken (error in the etc/di.xml)

[gonzaloebiz]

Issue Description

Preconditions

1. All magento versions
2. mc-magento2 10x.x.54

Steps to reproduce

1. Add a product to the cart
2. Go to checkout
3. Try to complete the checkout

Actual and Expected result

Expected result:
Order is placed successfully, customer is redirected to the success page.

Actual result:
The order fails.