[EN] A required 'Subtype' entry is missing

Description

An object in the PDF does not have a type (Subtype) defined, e.g., for XObjects or annotations.

Common Causes

• Missing or incomplete object information generated by the PDF creation software.

• Manual editing or corruption that removed or altered the Subtype entry.

• Use of non-standard or outdated PDF tools that do not fully support PDF object definitions.

Suggested Solutions

• Repair the PDF: Use tools like Callas pdfToolbox or PitStop Pro to add the missing Subtype entries.

• Check the source software: Ensure that the export generates complete object information.

A help article can be found here:
x [DE] Überblick – Syntax-Fehler in der PDF Seitenbeschreibung