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Resolve “unable to find an entry point” error

13 Feb 20261 minute to read

Starting with 21.1.0.35 (2023 Volume 1), the Pdfium package was upgraded to improve text search, selection, rendering, and performance. After upgrading, the PDF Viewer may display a “Web-Service is not listening” error. In most cases, the Network tab reveals that an outdated Pdfium assembly is referenced in the local web service project. Ensure the correct native assembly is deployed for the target OS:

  • Windows: pdfium.dll
  • Linux: libpdfium.so
  • macOS: libpdfium.dylib

Error information in the Network tab

Resolution steps

  1. Delete the bin and obj folders in the web service project.
  2. Rebuild and republish the web service.

NOTE

When hosting in cloud environments (Azure, AWS, container platforms), always remove or overwrite older published files to avoid stale native binaries remaining on the host.