"No such class" error when building an apk with "OCR Extension | Version 5"

When building any app that uses this extension or just the example app provided, I get this error message:

This has appeared sporadically in the past, but almost every time in the last months. The error appears to come and go completely randomly.
Can somebody help?

is there any other extensions you are using
well i just iimported extension and build my apk but its building without error

Thank you for the suggestion. However, I only use this extension at the moment.

please change the category for this topic.
In the #extensions category, we upload some extensions; not the problem with the extensions