Cannot load assembly problem

Question

I receive the following error:

Cannot load assembly. Error details: System.BadImageFormatException: Could not load file or assembly 'file:...' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

This assembly is built with .Net Framework 4.0 and i made sure that all projects in my solution are also built with .Net Framework 4.0.

Any idea why i am getting the error? How can i check which frameworks are loaded with my application?

check the app.config, do you have some entries like supportedRuntime or requiredRuntime? — Davide Piras
– Davide Piras, Commented Sep 6, 2011 at 20:22
Is this a Windows-Service? If so, have you tried to install it with the 64bit version of Installutil? — Tim Schmelter
– Tim Schmelter, Commented Sep 6, 2011 at 20:23
This is my config: <?xml version="1.0"?> <configuration> <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup> </configuration> — Erik Sapir
– Erik Sapir, Commented Sep 6, 2011 at 20:25

Jon Skeet · Accepted Answer · 2011-09-06 20:22:05Z

3

What is the main executable, i.e. the assembly responsible for deciding which version of the CLR is loaded? Note that it's not just a case of being built by .NET 4 - if your executable targets .NET 3.5 or lower, it will load in the .NET 2.0 CLR, and your .NET 4 assemblies won't load.

answered Sep 6, 2011 at 20:22

Jon Skeet

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3 Comments

Erik Sapir Over a year ago

In the properties of the main executable project, i see that Target Framework is: .NET Framework 4.0

Jon Skeet Over a year ago

@Erik: Can you tell us more about the application? What sort of app is it? Do you have anything in the app.config about supportedRuntime?

Erik Sapir Over a year ago

I posted the content of the config in the comments of the question. The application is console application. It loads some DLL's from other project (all built with .NET Framework 4.0 - checked)

Bruno · Accepted Answer · 2012-06-15 13:26:01Z

0

Hello I Had the same problem until i follow these hints: BadImageFormatException Class (section "Remarks")

In my case I was trying to load assemblies with call to umnaged code.

answered Jun 15, 2012 at 13:26

Bruno

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