If not specified, what error can occur with the Read PDF with OCR activity?

The activity "Read PDF with OCR" is designed to extract text from PDF documents, particularly those that are scanned or image-based. When this activity is used, an OCR (Optical Character Recognition) engine is essential for it to function properly because the activity relies on the OCR engine to interpret visual information in the PDF. If no OCR engine is specified, the system may not know how to process the image-based content, which leads to the inability to perform OCR on the document.

This means that if the user does not specifically choose or define an OCR engine within the activity settings, the activity will not execute as intended, and an error related to the absence of an OCR engine will occur. The presence of an OCR engine is a prerequisite for the processing of image-based PDFs, so without it, the operation cannot proceed, leading to a failure in executing the task.

Considering this, the identification of the issue as a result of not specifying an OCR engine is crucial for understanding how to properly configure the activity for successful execution.