Sudden Error: Could not load type System.ServiceModel.Activation.HttpModule - Urgent Help Please

Question

hi,

I have a windows 7 machine with IIS 7. I was hosting WCF services on IIS normally and i had a couple of services running.
Suddenly (i honestly did not do any configuration changes on my machine) all these services stopped working. When i try to browse the .svc file i get the following error:


"Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'"

Just in case this information is helpful, all these services are running on the basicHttpBinding.

Please help!

Answer 1

by the way, dll System.ServiceModel is available in the GAC with the correct token!

Answer 2

Not sure if this applies to your problem but it is the same error (copied from http://download.microsoft.com/download/0/A/E/0AEB3BC1-506E-4954-8AB1-4FA2EE75985C/ReleaseNotes.docx):

Could Not Load Type ‘System.ServiceModel.Activation.HttpModule’

When attempting to run a service that receives messages over the HTTP transport, you may receive an error similar to the following:

Server Error in '/WCFApplication' Application

Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

Description: An unhandled exception occurred during the execution of the current Web request. Review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.TypeLoadException: Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

This error can occur when IIS is installed after installing .NET Framework 4, or if the 3.0 version of the WCF Http Activation module is installed after installing IIS and .NET Framework 4.

To resolve this problem, you must use the ASP.NET IIS Registration Tool (Aspnet_regiis.exe,) to register the correct version of ASP.NET. This can be accomplished by using the –iru parameters when running aspnet_regiis.exe as follows:

aspnet_regiis.exe -iru

Answer 3

Bruno,

many thanks buddy, that solved my problem.

i still do not know what caused the issue in the first place because everything was working and i did not change a thing...anyway i will live with that :)
thnx again

Answer 4

No problem, glad I could help.

Answer 5

Ditto the big thanks to you Bruno - saved the day

Answer 6

I ran into the same problem.

 

ENV = Lab/Test usage on Win2008 Ent R2 x64.

Test app = VS2010 MVC sample app with ASPNET SQLREG setup and working well.

Then I added some new features into the server and that's been it broken.  Seems to be very touchy with the feature change config.  I would like to see more intelligence in the feature installer to ensure I don't break anything.

 

aspnet_regiis.exe -iru fixed my issue.

 

Thanks,

 

Tony

 

 

Answer 7

I happened to run ServiceModelReg.exe of v3.0 and all my ASP.NET 4.0 websites crashed. Your solution works! Many thanks.

Answer 8

Saved me too.  I was about to sweep a pc.!

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Love, praise, and worship God :)

Answer 9

Thanks a lot, this saved me too!

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C# + BizTalk2009 Developer

Answer 10

Many many thanks, Bruno!!

Answer 11

Many thanks.

I don't know if it's mentioned in previous posts, but I want to add following thing: you should run "aspnet_regiss.exe" under Administrator Right, otherwise you still get the error.

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Next time when you think you're perfect, try to walk on the water!

Answer 12

yep you can do that ...but win 7 did not give me that option as running aspnet_regiis.exe  ran too fast --- so
if you want just REPAIR - > the  Microsoft .NET Framework 4

if you installed Microsoft .NET Framework 4 with the web platform installer you will probably have to download
Microsoft .NET Framework 4 again ...search it.. then when you "install" select REPAIR ...then every thing comes up roses !

Answer 13

Tons of Thanks Buddy. Ditto Helped.

 

Thanks

Jaitley

Answer 14

Solved my issue too, thanks!!

 

As far as I remember, I'd installed a CTP related to Entity Framework POCO / code-first, and this is the first time I tried to run the site since then...

Answer 15

Not sure if this applies to your problem but it is the same error (copied from http://download.microsoft.com/download/0/A/E/0AEB3BC1-506E-4954-8AB1-4FA2EE75985C/ReleaseNotes.docx):

Could Not Load Type ‘System.ServiceModel.Activation.HttpModule’

When attempting to run a service that receives messages over the HTTP transport, you may receive an error similar to the following:

Server Error in '/WCFApplication' Application

Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

Description: An unhandled exception occurred during the execution of the current Web request. Review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.TypeLoadException: Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

This error can occur when IIS is installed after installing .NET Framework 4, or if the 3.0 version of the WCF Http Activation module is installed after installing IIS and .NET Framework 4.

To resolve this problem, you must use the ASP.NET IIS Registration Tool (Aspnet_regiis.exe,) to register the correct version of ASP.NET. This can be accomplished by using the –iru parameters when running aspnet_regiis.exe as follows:

aspnet_regiis.exe -iru

Correct. Problem solved. JCruz

Answer 16

Thank you very much.  Yes, I did install WCF HTTP Activation after installing IIS.  This is good to know.

Answer 17

Great Sir,thank you so much...

Answer 18

Thanks big time!!

Answer 19

yes, it works, thanks.

Answer 20

Since there are likely several aspnet_regiis.exe executables on your system, this additional note may be helpful:

NOTE: When running aspnet_regiis.exe, you must ensure that you run the version supplied with the .NET Framework version that you want to use. The .NET Framework 4 version of aspnet_regIIS.exe is located in the following path(s):

• 32-bit systems: %SystemRoot%\Microsoft.NET\Framework\v4.0.30319
• 64-bit systems: %SystemRoot%\Microsoft.NET\Framework64\v4.0.30319

Version current as of 1/25/2011

Answer 21

Hi Bruno wouters,
Thanks. It sounds great. I am new to WCF. You have helped me a lot. Thank you.

Answer 22

Thanks a lot.

Answer 23

Tnx a lot.you have saved me!

Answer 24

Thanks a lot.............

I faced the same after installing Sharepoint 2010, i don't know the exact reason. Anyway thanks.

aspnet_regiis.exe -iru  Solved the issue...........

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Regards, Surya

Answer 25

Thank Bruno,

aspnet_regiis.exe -iru 

perfect answer

Answer 26

Thanks... it helps so much

Answer 27

Thanks very much!! Stumbling upon this post has just resolved a couple of hours head-scratching

Answer 28

aspnet_regiis.exe -iru solved my problem too! 

Thanks!!

Answer 29

Thanks Bruno

I faced same problem while accessing the WCF service.

I have executed the command as you mentioned in the document.

After that it is working fine.

 

Thanks a lot.

Answer 30

Bruno, Thank you for the heads up on this. I ran across this during my OpsMgr 2012 testing. Ran it the command and happy as a can be.

 

 

Answer 31

Спасибо. Реально помогло. Я запускал на SBS 2011 - а это 64 бит ОС. Однако запускал по этому пути: 32-bit systems: %SystemRoot%\Microsoft.NET\Framework\v4.0.30319

32-bit systems: %SystemRoot%\Microsoft.NET\Framework64\v4.0.30319 - получал ошибку - приложение не win32.

Спасибо.

Вот теперь и не знаю что думать про SBS, ожидал, что там ВСЁ настроено, и готово к эксплуатации.

Answer 32

Everything was workign fine. And suddenly i started getting this error.

I just restarted IIS and it started working for me. Phew!

Answer 33

Not sure if this applies to your problem but it is the same error (copied from http://download.microsoft.com/download/0/A/E/0AEB3BC1-506E-4954-8AB1-4FA2EE75985C/ReleaseNotes.docx):

Could Not Load Type ‘System.ServiceModel.Activation.HttpModule’

When attempting to run a service that receives messages over the HTTP transport, you may receive an error similar to the following:

Server Error in '/WCFApplication' Application

Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

Description: An unhandled exception occurred during the execution of the current Web request. Review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.TypeLoadException: Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

This error can occur when IIS is installed after installing .NET Framework 4, or if the 3.0 version of the WCF Http Activation module is installed after installing IIS and .NET Framework 4.

To resolve this problem, you must use the ASP.NET IIS Registration Tool (Aspnet_regiis.exe,) to register the correct version of ASP.NET. This can be accomplished by using the –iru parameters when running aspnet_regiis.exe as follows:

aspnet_regiis.exe -iru

Answer 34

Thank you for this post !!   I had installed 3.5 on Windows 2008 and then had to re-run aspnet_regiis -iru to get framework 4 working again.

Answer 35

Hi Bruno,

 

Many thanks for the suggestion, it's people like you that keep the non-techies safe in this world!

 

Aad

Answer 36

Thanks a lot, solved my issue, I was having issue while creating an MVC application. but 

aspnet_regiis.exe -iru

solved my issue

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Thanks & Regards Sumit Gupta

Answer 37

Phew, skin saved, system outage of about 90 seconds.

In my scenario it was enabling Application Server role on Win2008... the addition of .net3.5 stuff threw out the registration of .net4.

Answer 38

Thanks

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Frank Xu Lei--谦卑若愚，好学若饥
专注于.NET平台下分布式应用系统开发和企业应用系统集成
Focus on Distributed Applications Development and EAI based on .NET
 

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Answer 39

Thanks alot. You saved my day.

Answer 40

Yes, thank you very much Bruno.  By looking at the replies, you saved many hours of frustration for many folks for many months.

Answer 41

I got this error while running a sample application in the Windows Azure SDK emulator.

Thank you so much!!!

For others, the aspnet_regiis.exe can be located as follows:

The tool for 64-bit systems in located in the Framework64 directory of the Microsoft.NET directory inside the Windows folder; for example C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727 would contain the IIS Registration Tool.

Thanks,

Sandeep.

Answer 42

Thanks Bruno. You saved me a lot of grief. - cheers

Answer 43

Solved my problem,

 

Thanks

Shiv Guddadmath

Answer 44

Worked Perfectly. Good find.

Answer 45

Thanks so much. solved my problem

Answer 46

Thanks a million Bruno.  Worked like a charm.  Now I can get to DevCamp prepared

Answer 47

It worked for me too..

Answer 48

Great!! you saved my life..

Answer 49

Thanks Bruno, worked like a charm

Answer 50

Worked for me too !

Thank you :-)

Answer 51

Thanks your help....!

Answer 52

This fix won't work on Windows 8 since aspnet_regiis.exe won't run on it.  

For Windows 8, you have to go to Windows features and enable everything under ".Net Framework 3.5" and ".Net Framework 4.5 Advanced Services".  

For more on what else I tried that didnt work, see http://blog.josh.mouch.name/?p=138">.

Answer 53

I realize this is very old and you may not get this... but unfortunately this didn't help me and everywhere I see this issue listed in various forums this is always the thing to do and it always works but it didn't for me. I ran the aspnet_regiis.exe -iru command and it finished properly but then my problem persists. Each time I run the app I get the same error in the browser.

I am running VS2010 on Windows 7 32-bit. I don't have IIS or IISExpress installed and am only using the built in VS2010 Webserver for development. I found an answer somewhere else that said to modify the applicationhost.config file and I don't have that file since I don't have IIS.

Any other ideas on how to solve this issue?

Thanks,

Scott

Answer 54

This can be accomplished by using the –iru parameters when running aspnet_regiis.exe as follows:
aspnet_regiis.exe -iru

start-> Run--> c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -iru

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Deepak_K