Resolve “Unable to find an entry point named FPDFText_GetCharAngle” error

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 In most cases, the Network tab reveals that an outdated Pdfium assembly is referenced in the local web service project.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

To solve this issue, you should follow the below steps:

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

NOTE

If hosting in Azure, AWS, or Linux environments, remove old published files on the server before republishing.