How to Resolve 'Could Not Load File or Assembly' Errors in Unity?

Troubleshooting the "Could not load file or assembly" error in Unity

The dreaded "Could not load file or assembly or one of its dependencies" error in Unity can stem from several sources. Let's explore common causes and effective debugging strategies.

Root Causes:

• Mismatched Dependency Versions: A key culprit is version incompatibility. Your project might reference an assembly (e.g., ServiceLocator.dll) that requires a specific, older version of a Unity assembly (e.g., "1.2.0.0"). Referencing ServiceLocator.dll without also including the required older Unity version will trigger this error.

• Outdated Assemblies in the Output Directory: The build output folder might contain obsolete Unity assemblies, leading to conflicts.

Debugging Steps:

To pinpoint the problematic assembly:

1. Utilize FusLogVw: Enable FusLogVw to capture detailed assembly loading logs. Run your Unity project and examine the generated log file.

2. Locate the Initial Unity Assembly Load: In the FusLogVw log, find the first entry indicating a Unity assembly load.

3. Inspect the Calling Assembly: Double-click this initial entry to reveal the assembly attempting to load the incompatible dependency. This identifies the source of the conflict.

Further Troubleshooting:

• Verify Assembly Versions: Double-check that all assemblies referencing Unity components have the correct version numbers specified in their respective project files.

• Clean and Rebuild: A clean solution followed by a rebuild often resolves issues caused by lingering outdated assemblies.

• Investigate Third-Party Assemblies: Examine any third-party assemblies integrated into your project, as they may be the source of the incompatibility.

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