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

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 In most cases, the Network tab reveals that an outdated Pdfium assembly is referenced in the local web service project.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

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

  • An outdated or mismatched native Pdfium binary deployed with the web service (different version or built for a different architecture).
  • A missing native library in the published output.
  • Incorrect bitness (x86 vs x64) for the hosting environment.
  • File permission, antivirus, or file-locking issues preventing the native DLL from loading.

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.