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.netintegration-testingappdomainassembly-resolution

How can it be that .Net cannot find the System assembly?

I'm having the following error while executing some integration tests:

The assembly with display name 'System' failed to load in the 'Load' binding context of the AppDomain with ID 4. The cause of the failure was: System.IO.FileNotFoundException: Could not load file or assembly 'System, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

These tests used to work in the past and I don't know how can be that such a basic dll is not found. Moreover, the System assembly has been already loaded:

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By the way, the code executing is creating AppDomains to execute Integration tests in case this matters.

EDIT: Looks like we have the required frameworks installed:

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Solution

  • I finally found the problem: the app.config was corrupted due to a "too wide" search and replace and seems that this was the culprit of the strange System load.