Reporting Services 2012 deploy error: “Error while loading code module”

I've found the answer. Problem were permissions for viewing report in Visual Studio Preview mode.

First of all, I was putting dll (with localization class) into next location:

C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PrivateAssemblies.

After that, I needed to change RSPreviewPolicy.config file, that exists in same folder location, to apply some security permissions.

In question, I mentioned that I've added one PermisionSet, but now I am sure there is no need for that.

I've just changed two CodeGroup section, which have Execution permission level, to have FullTrust permission level, like this:

<CodeGroup
    class="UnionCodeGroup"
    version="1"
    PermissionSetName="FullTrust"
    Name="Report_Expressions_Default_Permissions"
    Description="This code group grants default permissions for code in report expressions and Code element. ">
    .
    .
    .
</CodeGroup>
<CodeGroup
    class="FirstMatchCodeGroup"
    version="1"
    PermissionSetName="FullTrust"
    Description="This code group grants MyComputer code Execution permission. ">
    .
    .
    .          
</CodeGroup>

Regarding your version of Visual Studio, you must choose appropriate folder path:

• for VS 2015 --- C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\PrivateAssemblies
• for VS 2013 --- C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\PrivateAssemblies
• for VS 2010 --- C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PrivateAssemblies

Well this may be a very late reply, but it may help somebody

Firstly, you have to validate the session and the re-direct to the logout URL. Otherwise, the session remains and the user is moved to the landing page, even though we redirect to the logout url. So, this is what one should do

HttpServletRequest request = PortalUtil.getHttpServletRequest(actionRequest);
request.getSession().invalidate();
actionResponse.sendRedirect(themeDisplay.getURLSignOut());

Hope this helps.