/
Xrev Transmit Failed to Start

Xrev Transmit Failed to Start

 Problem

I receive an error message when starting Xrev Transmit. “An error occurred during startup and the application will be terminated. FileLoadException: Could not load file or assembly 'Autofac, Version=8.0.0.0, Culture=neutral…”

image001.png

 Solution

This error is typically related to overwriting the config file with a version from an older release. As outlined on our deployment page, this config file can occasionally be updated to support new functionality or changes in Revit. Particularly in Revit 2025, when Autodesk upgraded from .NET Framework 4.8 to .NET Core 8.0.

Ensure the version of the config file you are copying, matches the installed version of Transmit. During an install config files are automatically upgraded as needed, so ensure you copy one that has already been updated. You can manually update a config file using this command line using Windows-->Run, or via a script.

"C:\Program Files\Xrev Transmit\XrevTransmit.exe" MigrateConfig

When copying this command line, if it fails, the quotation marks may have been substituted for a special character. So simply re-type them.

 Related articles