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Editorial Team
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Asked: 2026-05-30T13:29:11+00:00

How do you solve the error message that looks like this? `Binding session to

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How do you solve the error message that looks like this?

`Binding session to 'C:\Program Files (x86)\NLog\.NET Framework 4.0\NLog.dll'...

error FS0193: API restriction: The assembly 
'file:///C:\Program Files (x86)\NLog\.NET Framework 4.0\NLog.dll' has 
already loaded from a different location. It cannot be loaded from a 
new location within the same appdomain.

Code that triggers it, might look like this:

#r @"..\packages\NLog.2.0.0.2000\lib\net20\NLog.dll"
NLog.Config.SimpleConfigurator.ConfigureForConsoleLogging()
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1 Answer

  1. Editorial Team

    It seems that FSI won’t load from the given DLL other than by name, so this would sort the problem out:

    #I @"..\packages\NLog.2.0.0.2000\lib\net20"
#r @"NLog.dll"
NLog.Config.SimpleConfigurator.ConfigureForConsoleLogging()

    #I means to add that folder to the load-path

    #r means to reference by dll-path; focusing on name. This means that FSI will use the file name first, looking in the system-wide search path and only then try to use the string after #r as a directory-relative hint.

    So by doing it this way, you make the NLog load from your specified directory rather than a system-wide one.

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