Configuration and Deployment

Re: Could not load file or assembly App_Web...

JonF — Tue, 01 Dec 2009 17:29:27 GMT

Crazy old issue. I've been getting the same problem. The hotfix didn't work. I found I had to make changes to the code, resave, rebuild and cross my fingers.

Re: Could not load file or assembly App_Web...

thermalnoise — Thu, 19 Nov 2009 14:58:38 GMT

Yes, please take some time to contact Microsoft and work on your issues. We did and were able to resolve this problem once and for all. After Microsoft determined the cause was due to their code, we were refunded the cost of the support ticket. If you go back through this thread, starting on 17 Oct 2006, you can see how it played out. We also used the hotfix I linked on 19 Dec 2007.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;934839

Re: Could not load file or assembly App_Web...

JamesChe — Thu, 19 Nov 2009 14:34:26 GMT

As you can tell from looking through the numerous posts here, there are many different scenarios that can cause this, and it happens in many different circumstances. If you're having this issue, you would be best off to open a support incident with us so that we can look into it.

Jim

Re: Could not load file or assembly App_Web...

Meltac — Thu, 19 Nov 2009 14:00:24 GMT

As far as I know the issue has not been really solved yet. Neither there has been any feedback from any M$ guy as well.

In my case, I narrowed down the problem to those assemblies that contain textual resources such as embedded javaScript files, which are loaded from client via the WebResource or ScriptResource handler. Other assemblies that do not contain such resources have never caused the error until now.

I wonder what makes assemblies with javascript or other resources that difficult to keep being loaded correctly by the CLR!?

Has somebody faced similar issues yet?

Re: Could not load file or assembly App_Web...

mudithaa — Thu, 19 Nov 2009 11:18:27 GMT

I havent had the time to read all the posts on this tread. So at this moment I dont know if there is a permanant fix for this issue.

Hoeever for me deleting the temporary files and restarting IIS fix the problem for a while but it keeps coming up.

Hope this will be helpfull to someone who is seeing the error, I@ll try and read the posts to find out if there is a permanant solution.

Re: Could not load file or assembly App_Web...

rosdikasim — Sat, 07 Nov 2009 14:37:34 GMT

I could not believe this problem has been reported since 2006!

It happened on my win 2003 today.. (this server always has the latest patches).

What I did to fix it was update the code (with some dummy text, or just type a few spaces and delete it back, then save) to force recompile of the code.

Hope it will not happen again or I will be really mad lol.

Re: Could not load file or assembly App_Web...

sam.psys — Fri, 06 Nov 2009 19:21:05 GMT

did you try deleting all of the asp.net cache

Re: Could not load file or assembly App_Web...

ilearn — Mon, 02 Nov 2009 16:16:35 GMT

Hi All,

I know this is discussed a long time (this ad starts at 2006 and we're in the end of 2009). I was wondering if someone did fine a fix to this issue cause I am facing with trouble without having any idea of HOW TO FIX IT.

The problem occurs only in production server but the apps works fine if I my dev machine when I play the application.

The error on the server is : Could not load file or assembly 'App_Web_ndhwjb-l'

I am using VS2008.

Tks for your help

Re: Could not load file or assembly App_Web...

kg86 — Tue, 18 Aug 2009 12:58:40 GMT

Have the same error. When I try to change compilation batch to false, then I can't even rebuild my project - couldn't find usercontrol assemblies. It is really weird. Why microsoft still haven't provided a fix for this? Anyone has some actual information from support center about this problem?

Re: Could not load file or assembly App_Web...

warnov — Wed, 29 Jul 2009 06:19:23 GMT

Well, by fortune it worked for me too changing the debug value from true to false... I hope it won't happen again even with debug=false. it will be a nightmare. And I feel so sorry for the ones having this problem even under this circumstances. We really need a FIX for this!!!!!

I almost fight with the support guy for this!

Re: Could not load file or assembly App_Web...

Meltac — Tue, 07 Jul 2009 13:02:55 GMT

Thx for the post Bit.

I had followed the prior posts already and had successfully eliminated the problem from production environment applying the hints given here. No problem so far.

But, what I'm still curious about is the fact that

The problem still occurs with the latest release of .NET Framework (and Visual Studio), altough the issue seems to be well known since several (!) years already,
The problem only occurs with some, but not with all assemblies.

I recently had a case where splitting a project (which formerly generated the error) resulted in one "good" and one "bad" assembly (one with and the other without the problem).

So I was wondering whether some specific code, settings, references, ressources, or other content in an assembly is / are responsible for potentially generating the error!?

I have not yet been able to do any further research on this, but I think if it was possible to encircle the problem source (being for example one specific ressource type), developer's life would become much easier at last because one would know at least what actions potentially may result in this problem.

Meltac

Re: Could not load file or assembly App_Web...

BitWizard — Mon, 06 Jul 2009 12:39:17 GMT

Just a quick post -- I'm away from my desk.

This looks like the same problem to me. I get this frequently in development. I've pretty much eliminated it from production.

First of all, make the suggested changes to web.config and machine.config discussed earlier to increase the time between automatic recompiles. There's a link to a pretty good discussion on the cause of this problem as well in a prior post.

In development, simply force a full recompile, and this will probably fix the problem. If it does not, delete the temporary files in your asp.net subdirectory in Windows (see earlier post), and recompile.

In production, whenever you make a change to an ascx, ascx.vb, or ascx.cs file, force a complete recompile. This requires knocking down the server (use "pause") for a couple of minutes or the compile is unlikely to finish correctly. I use a batch file now for this (see prior posts). Then unpause your server. If you don't do this, there's a chance your server will crash with something like the above error within a few hours. The only fix after this is to delete the temp compiled files and start over.

FTR, the "crazy" filename you encountered was generated by Windows and refers to an intermediate compilked file. Because of a thread synch issue (we think), the file was deleted while it was still being referenced by the compiler. Once this happens, the app will no longer run until you delete all the temp files and force the compiler to start over.

Bit

Re: Could not load file or assembly App_Web...

Hisham_Saleh — Sun, 05 Jul 2009 18:48:18 GMT

Actually I built that website successfuly ,also it is working properly ,but since im uploading in some server i dont know the configurations ,this problem happened, as noticed the dot net version of the server has to be upgraded, also some configuration should be done for that server because this host has its own configuration panel and it has a lot of options

Mr.Meltac, Dont worry ,Nothing will fail :)

Re: Could not load file or assembly App_Web...

Meltac — Sun, 05 Jul 2009 16:53:18 GMT

Well, I am little bit confused. Why do you inherit from the assembly

App_Web_hazc5xyw

Considering the file name, this looks for me as if you were referencing to an auto-generated assembly whose file name probably will change with the next compilation. If so, your approach would not be a good idea and will fail sooner or later.

Furthermore, the error message in your post is different from the one we are discussing here, so I think your problem does not address the same issue. Probably you will find better answers in other threads!?

Re: Could not load file or assembly App_Web...

Hisham_Saleh — Sun, 05 Jul 2009 13:14:27 GMT

I Have the same problem

Server Error in '/' Application.

Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load the assembly 'App_Web_hazc5xyw'. Make sure that it is compiled before accessing the page.

Source Error:

Line 1:  <%@ page language="VB" masterpagefile="~/MasterPage.master" autoeventwireup="true" inherits="Contact, App_Web_hazc5xyw".....>Line 3:

Version Information: Microsoft .NET Framework Version:1.1.4322.2407; ASP.NET Version:1.1.4322.2407