How to fix «Unable to process binding "blockLoader: function (){return isLoading }"»?

Administration Third-party extensions
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How to fix

File: app/design/frontend/Thelist/westyle/Magento_SalesRule/web/template/payment/discount.html

Replace:

<form class="form form-discount" id="discount-form" data-bind="blockLoader: isLoading">

with

Then, redeploy the static content:

rm -rf pub/static/* && bin/magento setup:static-content:deploy