Hash validation failed for file or assembly 'AjaxControlToolkit'

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I got the following error message on a asp.net 3.5 application, once I published the website again the error stopped. How do I avoid this error in future instead of publishing the website again?

Posted 22-Mar-11 8:29am

Bharathy Sadagopan

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pankajupadhyay29 22-Mar-11 14:49pm

what is the complete error message and stack???

Bharathy Sadagopan 23-Mar-11 9:04am

Here is the complete error message.

CALLING OBJECT NAME: Assembly

CALLING METHOD NAME: _nLoad

System.Exception[]ADDITIONAL MESSAGES: mscorlib

TYPE: System.IO.FileLoadException

BASE EXCEPTION: System.IO.FileLoadException: Hash validation failed for file or assembly 'AjaxControlToolkit'.
File name: 'AjaxControlToolkit'
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.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

Sandeep Mewara 22-Mar-11 17:25pm

Sounds like an old version of Ajaxtoolkit. Is it? What version is it?

Bharathy Sadagopan 23-Mar-11 9:06am

It is April 2010 Release, binary version for .net 3.5.

Sandeep Mewara 23-Mar-11 9:40am

All looks good. Try uninstall and then reinstall.

Bharathy Sadagopan 23-Mar-11 10:01am

I got this in my test server. So I published the web site again and everything is working. I couldn't track down to what caused it to break, but I am afraid to deploy this in our production server if I will have to deploy this whenever I see this error. So I would like to fix the root cause of this rather than publishing the web site.

Sandeep Mewara 23-Mar-11 10:10am

Hmmm...Ok.

pankajupadhyay29 23-Mar-11 13:12pm

the cause behind is your ajaxtoolkit file it might be due to you are missing ajax dll or version mismatch.

Bharathy Sadagopan 23-Mar-11 14:04pm

I checked the ajax dll and it was in the bin directory and I get a different error when the dll is missing "Could not load file or assembly 'AjaxControlToolki1t'".

This site was working and suddenly it stopped working one day so I had to publish the website again. If it is due to version mismatch then I should have had this error when I first published this site in our server.

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