Strange and random occuring Assembly not found error.

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Hi all,

I did a simple ajax services (json based) to get some data from database.
The problem stated below:

On localhost: while programming/editing the aspx page in visual studio and seeing the result in browser it works fine for say 5-6 times of editing the aspx page, and then just start failing. Until I go to my web service interface class do something (say just put a newline somewhere) and recompile it. The problem get fixed and the cycle goes on...

When I trace the failed requests in fire bug I found 500 internal server error:
[FileNotFoundException: Could not load file or assembly 'App_Web_lbgnha4m, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.]
*can give the stack trace if required.

I am not sure, but looks like this file 'App_Web_lbgnha4m' is generated temporary because everytime I fix this error by recompiling the code. After some time it again comes back with new name 'App_Web_blahblahblah'

My biggest concern is that when I deploy the solution to my staging server. the service worked fine (say for a day) and then same error, quite surprised what goes wrong without touching a file once deployed). Obviously I can’t deploy the solution every day to fix this....

Any suggestions please help......

Full Stack Trace:

[FileNotFoundException]: Could not load file or assembly 'App_Web_lbgnha4m, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
   at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
   at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
   at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.Load(String assemblyString)
   at System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses)
   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String normalizedVirtualPath)
   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(String normalizedVirtualPath)
   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath)
[ServiceActivationException]: The service '/Website/RESTfulService.svc' cannot be activated due to an exception during compilation.  The exception message is: Could not load file or assembly 'App_Web_lbgnha4m, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified..
   at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result)
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, Boolean flowContext)
   at System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Posted 24-Jul-11 21:33pm

saxenaabhi6

Updated 24-Jul-11 21:56pm

v3

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3 solutions

Solution 1

Hi,

Please post the complete Stack information. Are you getting this problem on any specific time of a day ?

Thanks,
Balaji Prabu

Posted 24-Jul-11 21:54pm

Balaji Prabu AL

Comments

saxenaabhi6 25-Jul-11 3:57am

no specific time..

Solution 2

Some hope on deployed solution on web server....
if I stop the website, recycle the application pool, remove all .Net temporary files and then restart the website...
looks like the problem is fixed on deployed solution as I am testing daily (3 days gone), the services are not throwing any error yet.

BUT what about my localhost, Any helps???

Posted 27-Jul-11 16:57pm

saxenaabhi6

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Christoph Keller · Accepted Answer · 2011-07-27T19:18:00

Hi,

For your information, the assembly App_Web_xxxxxx is the dynamically compiled assembly from your not-compiled ASP.NET Code. This assembly will be generated when you use the "New Website" command in VisualStudio rather than "New Project" => "ASP.NET Web Application".

This seems to be an old bug in ASP.NET 2.0 Framework and I found a forum post where they discuss about this:
http://forums.asp.net/t/986130.aspx/1?Could+not+load+file+or+assembly+App_Web+[^]

Perhaps this post could help you:
http://forums.asp.net/t/986130.aspx/7/10?Could+not+load+file+or+assembly+App_Web+#1620645[^]

=== from the post: ===

It seems there’s a timing issue when app domains shutdown and then startup where the appdomain deletes a file from temp asp.net files folder that the new app domain just created.

As mentioned, we hope to have a fix for this shortly – but one workaround that has worked for the other case was to increase the numRecompilesBeforeAppRestart to 50 (default is 15). This is in the web.config for the application.

HTML

<compilation
     defaultLanguage="c#"
     debug="false"
     numRecompilesBeforeAppRestart="50"
/>

===

Hope this helps.

Best regards and happy coding,
Stops