ProGet - Exception: Could not load file or assembly 'ProGet.WebApplication...

[jw]

After upgrading to 2025.6 from 2024.36 we occasionally have the following exception in logs. It is not quite clear what exactly triggers it.

An error occurred in the web application: Could not load file or assembly 'ProGet.WebApplication, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

URL: https://xxxxxx.local/0x44/ProGet.WebApplication/Inedo.ProGet.WebApplication.Controls.Layout.NotificationBar/GetNotifications
Referrer: https://xxxxxx.local/feeds/xxxxxxxx-nuget-proxy-telerik/Telerik.UI.for.AspNet.Core/2025.2.702
User: (unknown)
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36
Stack trace:    at System.Reflection.RuntimeAssembly.<InternalLoad>g____PInvoke|49_0(NativeAssemblyNameParts* __pAssemblyNameParts_native, ObjectHandleOnStack __requestingAssembly_native, StackCrawlMarkHandle __stackMark_native, Int32 __throwOnFileNotFound_native, ObjectHandleOnStack __assemblyLoadContext_native, ObjectHandleOnStack __retAssembly_native)
   at System.Reflection.RuntimeAssembly.InternalLoad(AssemblyName assemblyName, StackCrawlMark& stackMark, AssemblyLoadContext assemblyLoadContext, RuntimeAssembly requestingAssembly, Boolean throwOnFileNotFound)
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef)
   at Inedo.Web.Handlers.DynamicDelegateHandler.GetHttpHandler(GetHandlerParams args)
   at Inedo.Web.Handlers.DynamicHttpHandling.GetHandler(AhHttpContext context, String requestType, String url, String pathTranslated)
   at Inedo.Web.AhWebMiddleware.InvokeAsync(HttpContext context)

::Web Error on 31.07.2025 17:06:40::

When opening https://xxxxxx.local/feeds/xxxxxxxx-nuget-proxy-telerik/Telerik.UI.for.AspNet.Core/2025.2.702 the package site is shown and also the package can be downloaded without any problem or exception.
Deleting the package from the cache and repopulating the cache did not help either.

Opening https://xxxxxx.local/0x44/ProGet.WebApplication/Inedo.ProGet.WebApplication.Controls.Layout.NotificationBar/GetNotifications in a browser returns the following page:

For every reload of this page, a new entry of the same exception shows up in the logs.

[stevedennis]

Hi @jw,

That URL is for updating the notification bar -- typically you'll see this when someone has a browser Window open with the old version of ProGet that is attempting to load notifications from a URL that no longer exists.

Thanks,
Steve

[jw]

Hi @stevedennis

I'm not quite sure what to do with this information. Unfortunately the log message contains no information from whom or which IP this exception is triggered.

One question is what is the relation to the package that is mentioned in the Referrer. What could the notification be about?

Another potentially related issue is browser cache busting, which does not seem to work reliably. I have noticed this in the past and also with the upgrade to the 2025 version, that changes in the UI are only reflected after manually cleaning the browser cache or force reloading with Ctrl+F5.

From what I can see in the browser dev tools, some of the css files have a version query parameters, which I assume is meant for cache busting, but others (e.g. proget.css) do not.

Could this be related to the issue, that after the upgrade to 2025, some people are still seeing old versions of the UI and triggering this exception?

[stevedennis]

Hi @jw ,

You can ignore the message. There is no relation to a package; someone just happens to have that URL open in the browser, and the page is using AJAX to request updates to display the "alert bar" at the top. Eventually they'll close it and the error will go away.

Thanks,
Steve

[jw]

Thank you for the feedback.

I will observe for a while and reserve yelling at people to close their browsers for later. ;)