Troubleshooting: POSPac error, Could not load file or assembly

📌 Problem

Trajectory processing fails with POSPac local processing with errors similar to:

C260915_133458 : POS Data Import     : Could not load file or assembly
'Applanix.Pospac.Engine.GnssAPI, Version=2025.10.9586.24748, Culture=neutral,
PublicKeyToken=551d74244f0db52e' or one of its dependencies.

C260915_133458 : GNSS-Inertial       : Could not load file or assembly
'Applanix.Pospac.UI.Wrapper, Version=2025.10.9586.24773, Culture=neutral,
PublicKeyToken=551d74244f0db52e' or one of its dependencies.

The error occurs because required POSPac components cannot be loaded.

🔍 Root Cause

A corrupted or incomplete POSPac Desktop installation.

🧠 What is Happening?

LP360 relies on POSPac Desktop assemblies to perform trajectory processing. If these files become corrupted or are missing, LP360 cannot launch the POSPac processing engine and trajectory processing fails.

✅ Probable Resolution

Repair or Reinstall POSPac Desktop

1. Close LP360 and POSPac.
2. Go to the LP360 Portal --> Downloads --> Download the latest version of POSPac
3. Run the POSPac Desktop installer.
4. Select Repair. If Repair is unavailable, uninstall and reinstall POSPac Desktop.
5. Launch POSPac and confirm it opens correctly.
6. Retry trajectory processing.

📚 Additional Notes

• This issue is not typically caused by flight data or base station data.
• If the repair does not resolve the issue, perform a clean reinstall of POSPac Desktop.

📬 Need Help?

If you're still stuck, please Contact Support for assistance.