Failed to embed metadata into PDF

[shuvashish76]

When trying to embed metadata to one PDF it shows following error:

calibre, version 8.4.0
WARNING: Failed for some files: Failed to embed metadata into some book files. Click "Show details" for details.

The PDF format of Quantum Field Theory, as Simply as Possible:

Traceback (most recent call last):
  File "calibre/utils/podofo/__init__.py", line 36, in set_metadata
  File "calibre/utils/ipc/simple_worker.py", line 255, in fork_job
  File "calibre/utils/ipc/simple_worker.py", line 180, in run_job
  File "calibre/utils/ipc/simple_worker.py", line 119, in communicate
calibre.utils.ipc.simple_worker.WorkerError: Worker failed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "calibre/customize/ui.py", line 515, in set_file_type_metadata
  File "calibre/customize/builtins.py", line 527, in set_metadata
  File "calibre/ebooks/metadata/pdf.py", line 187, in set_metadata
  File "calibre/utils/podofo/__init__.py", line 40, in set_metadata
Exception: Failed to set PDF metadata in (Quantum Field Theory, as Simply as Possible): Traceback (most recent call last):
  File "calibre/utils/ipc/simple_worker.py", line 303, in main
  File "calibre/utils/podofo/__init__.py", line 97, in set_metadata_
podofo.Error: PdfErrorCode::NoEOFToken, No EOF Marker was found in the PDF file.
Callstack:t#0 Error Source: main/PdfParser.cpp(97), Information: Unable to load objects from file
t#1 Error Source: main/PdfParser.cpp(143), Information: Unable to load xref entries
t#2 Error Source: main/PdfParser.cpp(377)
File: main/PdfParser.cpp Line: 97 Unable to load objects from file
File: main/PdfParser.cpp Line: 143 Unable to load xref entries
File: main/PdfParser.cpp Line: 377

[kovidgoyal]

That error indicates the PDF file is corrupted.

[shuvashish76]

The PDF opens fine on Okular but thanks for the info,

[shuvashish76]

fixed it with https://stirlingpdf.io/repair