When launching 3ds Max, a Max.NET error is received that states an exception with the Ephere Utilities Evaluator or a similar module has occurred.

Max.NET Unhandled Exception
Exception and stack trace:
System. Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
—> System.TyInitializationException: The type of initializer for ‘Ephere.Utilities.Evaluator’ threw and exception.
—> System.IO.IOException: The process cannot access the file ‘C:\ Users\…”

Max .net error
Max .net error

In addition, once working in 3ds Max multiple errors display when trying to use various tools or when right-clicking on the viewport. Errors may be similar, but not limited those seen below:

Error saving to temp directory 3ds Max
Error saving to temp directory 3ds Max
States sets error 3ds Max
States sets error 3ds Max


Causes of this issue include, but are not limited to:

  • An installed anti-malware, anti-virus, or system optimizer program, such as ByteFence Anti-Malware, is flagging multiple 3ds Max plug-ins or components and denying access to them, leading to various errors and exceptions.
  • Corrupted Microsoft .NET or Visual C++ elements.


To address this issue, try the following:

  1. Follow the instructions in your firewall or antivirus program’s Help file to whitelist or add exclusions to the 3ds Max installation folder located in: C:\Program Files\Autodesk\3ds Max.
  2. Repair the Microsoft .NET framework installation by downloading and running the hotfix located here.
  3. Uninstall and reinstall the Visual C++ components: How to remove and reinstall Microsoft Visual C++ Runtime Libraries

See also:


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