Question

A parser error has occurred (IIS 6 and .net 2)

Asked by: Nyah247

The production web servers are getting this error multiple times a day.  I am not getting this error in any other region but production.  I am a server administrator with little knowledge of software development, "coding", or debugging.  How do I go about finding out what it causing these errors?  I have looked at several MS articles and other instructionals without much success.  The actual applications don't seem to be failing, at least it is not being reported by end users.  These also do not seem to correlate with any IIS app pool resets.

Event Type:	Warning
Event Source:	ASP.NET 2.0.50727.0
Event Category:	Web Event 
Event ID:	1310
Date:		8/24/2009
Time:		10:12:49 AM
User:		N/A
Computer:	
Description:
Event code: 3006 
Event message: A parser error has occurred. 
Event time: 8/24/2009 10:12:49 AM 
Event time (UTC): 8/24/2009 2:12:49 PM 
Event ID: 2c51529f823f41a38f679cd37f13e527 
Event sequence: 6077 
Event occurrence: 4 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/3/ROOT/MyDir-2-128955945118245760 
    Trust level: Full 
    Application Virtual Path: /MyDir
    Application Path: D:\InetPub\wwwroot\MyDir\ 
    Machine name: 
 
Process information: 
    Process ID: 10508 
    Process name: w3wp.exe 
    Account name: 
 
Exception information: 
    Exception type: HttpParseException 
    Exception message: Could not load type 'Mysearch.advancedsearch'. 
 
Request information: 
    Request URL: https://www.mysite.com:443/mydir/mypage.aspx 
    Request path: /mydir/mypage.aspx 
    User host address: 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: 
 
Thread information: 
    Thread ID: 14 
    Thread account name: 
    Is impersonating: False 
    Stack trace:    at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding)
   at System.Web.UI.TemplateParser.ParseReader(StreamReader reader, VirtualPath virtualPath)
   at System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath)
   at System.Web.UI.TemplateParser.ParseInternal()
   at System.Web.UI.TemplateParser.Parse()
   at System.Web.UI.TemplateParser.Parse(ICollection referencedAssemblies, VirtualPath virtualPath)
   at System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType()
   at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider)
   at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders()
   at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
   at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
   at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean noAssert)
   at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp, Boolean noAssert)
   at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
   at System.Web.UI.PageHandlerFactory.System.Web.IHttpHandlerFactory2.GetHandler(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
   at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig)
   at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 
 
Custom event details: 
 
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

                                  
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Asked On
2009-08-24 at 07:48:45ID24676693
Tags

IIS 6

,

ASP.Net

,

Web Development

Topics

Miscellaneous Web Development

,

.NET Framework 2.x

,

Web Servers

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: abelPosted on 2009-08-24 at 07:58:50ID: 25168965

I'm afraid you are going to need some coding experience to get this solved. On the referred to page, there's probably a class or a control (ascx) that is doing the advancedsearch (it apparently fails on your advanced search page). To resolve this error, we need two things:

1. It must be reproducible
2. Setup Visual Studio to debug (either local or remote)

Without the error reproducible, it will become really hard, even for experienced programmers and debuggers. If we can somehow get this reproducible, we have done half the work. To find out what to do, inspect your log files of IIS just before or around the moment the error occurs, so you know exactly what request was made (it will likely have an URL corresponding with mypage.aspx, but not necessarily).

-- Abel --

 

by: Nyah247Posted on 2009-08-31 at 10:51:01ID: 25224787

I can reproduce it.  Apparently it was caused by the Developer's code.  She removed a couple page references from her project (i.e. basicsearch.aspx and advsearch.aspx) and now just processes everything with a single page.  However, when people now try to go to these old pages directly the application cycles through, throws an error, then displays a contact the webmaster page.  This also generates the parse error since I assume she is not handling the error gracefully.  If All in all, I believe I need to speak with the Dev to try to make the case that this is probably not the best way to handle this.  I know this can have a performance impact on the application but any suggestions as to why this is not a good practice?

 

by: abelPosted on 2009-08-31 at 15:19:46ID: 25227041

It looks more that the old page is still around or is server side cached, and that the classes dealing with the searches have been replaced. In which case the developer needs to do proper testing before she enrolls a new version: some pages seem to use a version of the class that is not around anymore. Normally, a complete compile and new built of the software can solve this kinds of problems.

It is often a good practice to refactor code into more reasonable chunks. But before you refactor, you must have good Unit Tests. If you don't, refactoring can cause trouble like above.

-- Abel --

20120131-EE-VQP-002

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