As you have opened a support ticket on the same topic, I would like to post my answer here as well:
"In general, the error '$.blockUI is not a function' indicates that this might be related to the jQuery library that is not imported as required.
We have previously had this problem with Angular applications. The following steps helped to resolve the issue:
1. Install jQuery with the script :
npm install --save jquery
2. Import jQuery globally for the application:
import * as $ from
Hopefully, the approach would work also for you."
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