How to Debug 'Could not load file or assembly or one of its dependencies' Errors?

Troubleshooting "Could not load file or assembly, or one of its dependencies" Errors

This article provides solutions for resolving "Could not load file or assembly, or one of its dependencies" errors, such as those referencing Microsoft.Practices.Unity 1.2.0.0.

First, check for dependency conflicts. Outdated Unity versions referenced by other assemblies can cause this. For example, if ServiceLocator.dll relies on Unity 1.2.0.0, including it in your project will introduce an incompatible version.

Next, inspect your output directory. The presence of older Unity versions in the build output folder can lead to unexpected behavior and errors.

To pinpoint the problem's origin, use the FusLogVw utility. Enable logging, run your application, and examine the log for the first Unity load attempt. Double-clicking this entry will show the calling assembly, which is often the root cause of the incompatibility.

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