Exception from HRESULT: 0x80131047

Project > Project Properties > Name > remove the "'" from the name, and it will work :)

It may not necessarily be related to that as in my case...

First, I would like to say that this was a very hard issue troubleshoot as there may be many variables leading to the actual problem related to assemblies.

So I was working on an Outlook Add-In 2010 targeting the 32-bit version of Office. Everything was working fine until one day out of the blues, the add-in wouldn't load anymore and I was presented with error "HRESULT: 0x80131047". After searching almost half a day I found a nice article:

http://blogs.msdn.com/b/astebner/archive/2007/05/06/2457576.aspx

I tried adding the assembly to the global cache but was unable to. Luckily, I had an almost identical project which ran just fine and I had already done comparison checks and everything seemed the same, but on this pass I found something different ... as it turned out the platform target CPU was set to 64-bit so I changed it to "Any" and voila'! - this fixed it!

Yes , I just change my Project Name "Taqi's Project" to Taqi Project and It runs successfully.

I had an invalid .\Properties\licences.licx file that was causing this problem. This file is automatically generated by DevExpress components.

I just deleted this file and voila: Build Succeeded.

This MSDN forum post says that you need to take "special" characters such as slashes, commas, or apostrophes out of your assembly name to avoid that error.

If that doesn't fix it, another suggestion there is to uncheck "Enable the Visual Studio Hosting Process" in the Debug tab.

I had an invalid App.Config file that was causing this.

Somehow, I was missing the final closing tag to the main element.

</Configuration>

For anyone else that stumbles across this article and determines that their naming convention is correct and they are using the LoadFile method...

Here is the solution I came up with:

byte[] data = System.IO.File.ReadAllBytes(filename);
Assembly assembly = Assembly.Load(data);