Using A RenderAction Method Throws An Exception

i have this (simple) code

<% Html.RenderAction("Version", "Generic"); %>

in my masterpage of my asp.net mvc 2 app. This method returns the version of the application.

i also have this code in my controller:

class GenericController : BaseController
{
[ChildActionOnly]
public string Version()
{
try
{
string assemblyFile = Assembly.GetCallingAssembly().FullName;
FileInfo fi = new FileInfo(assemblyFile);
string version = fi.LastWriteTime.Year.ToString( ) + fi.LastWriteTime.Month.ToString() + fi.LastWriteTime.Day.ToString();
return version;
}
catch (Exception e)
{
return "1.0";
}
}
}

Now i get this error:
Execution of the child request failed. Please examine the InnerException for more information.

and the innerexcpetion is:
{"The controller for path '/Account/LogOn' was not found or does not implement IController."}

What i was thinking is that maybe the code can't execute because the user is not logged on yet, and tries to redirect to the logon method etc.

So the first thing i was thinking is to grant access in the web.config (like i do with the directory that has the css and images in it, it should also be accessable when you're not logged on:

<location path="Content">
<system.web>
<authorization>
<allow users="*" />
</authorization>
</system.web>
</location>

but what is the path for this (version) method ?

(or maybe there is another reason for the excpetion.