Intermittent PDF Export Failure with QlikView API - 'Prohibit validate' Error"

[alessandrovernile]

Hello everyone,
we are encountering issues with the QlikView API (Interop.QlikView) — specifically, we're trying to export a report to PDF using our own printer. Sometimes the PDF is generated without any issues, and other times it fails.

Looking into the .qvw log file, we found the following entries:

20250415T143120.000+0200 20250415T143122.000+0200 1 300 Error Doc::GetLayout error:14 message:"Prohibit validate": c22cd5b-aac9-4bcb-a4a3-a2a04b04288 20250415T143353.000+0200 20250415T143354.000+0200 1 300 Error ListBox::GetListBoxCellsEx error:14 message:"Prohibit validate": 89db8e5-d38c-4742-ba62-82b6c819910

We're using C# - .NET Framework 4.6.