Clickonce messagebox on install: Strong name signature not valid for assembly microsoft.mshtml.dll

Question

I've just started to get the following error in my clickonce application. I have just installed visual studio 2013 on my machine prior to this "Application validation did not succeed. Unable to continue. when i click into details I get ``` Activation of C:\Temp\ClickOnce\myApp\myApp.application resulted in exception. Following failure messages were detected: Strong name signature not valid for this assembly Microsoft.mshtml.dll. ``` I also get two warnings but I do not believe they are the cause of the problem - The manifest for this application does not have a signature. Signature validation will be ignored. - The manifest for this application does not have a signature. Signature validation will be ignored. Error Details are listed as ``` ERROR DETAILS Following errors were detected during this operation. * [02/12/2013 15:54:31] System.Deployment.Application.InvalidDeploymentException (SignatureValidation) - Strong name signature not valid for this assembly Microsoft.mshtml.dll. - So…

Accepted Answer

I got this sorted. what I had to do was go into my project right click, add reference to go assemblies - extensions and there were two dll files listed under Microsoft.mshtml. I hovered over each of them and seen that the path of one was

```
c:/program files/Microsoft.NET/Primary Interop Assemblies/Microsoft.html.dll
```

and

```
c:/program files/Microsoft Visual Studio 12.0/Visual Studio Tools For Office/PIA/Common/Microsoft.mshtml.dll.
```

The refernce my project had was the second one in visual studio - I changed the reference to the one in Primary Interop Assemblies under project properties I went to the publish tab and clicked on the application files I set publish status to include. Then I went to project properties/references and double clicked on microsoft.mshtml to open its properties, I set 'embed interop types' to false and 'copy local' to true (as copy local was grayed out to false).

after this I uploaded it to my clickonce server and was able to download and install it.

Clickonce messagebox on install: Strong name signature not valid for assembly microsoft.mshtml.dll

Solution

Problem