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Editorial Team
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Asked: 2026-06-15T02:09:56+00:00

I have an ASP.NET MVC project that loads fine when I start it directly.

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I have an ASP.NET MVC project that loads fine when I start it directly. When I try to run it vai the Azure SDK’s emulator, I get the following exception:

Could not load file or assembly ‘file:///C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\62253e0e\13ba4ff3\App_global.asax.a-wnopwm.dll’ or one of its dependencies. An attempt was made to load a program with an incorrect format.

This usually indicates something like a reference to a 64bit assembly on a 32bit system, but I’ve never seen this error on a ASP.NET project dll. The project configuration is set to AnyCPU. What gives?

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  1. Editorial Team

    The problem was due to the assemblyPostProcessorType attribute added to the system.web/compilation element of the web.config file when I used VS 2012’s performance analysis (profiling) tool. It doesn’t appear to clean up after itself very well and the config was left in place, causing an apparently assembly platform mismatch. It also caused problems when publishing to Windows Azure because the post-build assembly wasn’t available.

    The solution was to add a transform to the web config transform to remove the attribute (assemblyPostProcessorType).

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