Use Of a .Net 4 Assembly in ATEasy 8
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Cyril P.
Meung Sur Loire, France

Apr 19, 2011
20 Posts

Use of a .Net 4 assembly in ATEasy 8


I need to use a .Net assembly in ATEasy 8 which is develop on .NET 4.
I've got this error message when I tried to use it:
Runtime error #420 : 'Object method or property 'Instance' failed : unable to load the file or assembly. This assembly was build for a most recent runtime as the runtime currently loaded and cannot be loaded.

What could be the problem? Do I need to setup something in ATEasy 8 to select the .NET 4 framework?
Thanks for your help.

Albert Q.
Anaheim, CA

Apr 19, 2011
11 Posts

Re: Use of a .Net 4 assembly in ATEasy 8


Currently, ATEasy8 only support assemblies build with target .NET framework 3.5 or earlier. We will add support for .NET framework 4.0 in the future release of ATEasy8.

To work-around this problem, you need to create an application config file containing the following XML text :

<?xml version="1.0" encoding="utf-8" ?>
<!-- -->
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0.30319" />
<supportedRuntime version="v3.5" />
<supportedRuntime version="v3.0" />
<supportedRuntime version="v2.0.50727" />

The config file must have the same name as the application (e.g ATEasy.exe.config or MyApp.exe.config) and must reside in the same folder as the application. I have created and attached to this incident a sample config file, please download, rename the file and copy it to the ATEasy folder or the folder containing your stand-alone executable.


File Attachment:

Cyril P.
Meung Sur Loire, France

Apr 20, 2011
20 Posts

Re: Use of a .Net 4 assembly in ATEasy 8

Hi Albert,

thanks a lot, it works with my application.


Paul T.
Maennedorf, Zurich

Feb 17, 2014
54 Posts

Re: Use of a .Net 4 assembly in ATEasy 8

Hi! How about ATEasy 7? Does it support assemblies build with target .NET Framework 3.5?

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