Infamous assembly binding error

Question

I really need help on this because I lost my hopes to correct the problem.

I am using Office Communications Server 64bit libraries. There are 3 dlls I use in the project, Microsoft.Rtc.Collaboration.dll, Microsoft.Rtc.Internal.Media.dll and SIPEPS.dll. I am not sure about Microsoft.Rtc.Collaboration but Internal.Media and SIPEPS are both x64. On the GAC assembly list Rtc.Collaboration shows MSIL under Processor Arhitecture and the others show AMD64.

My project compiles without errors with these references but at runtime I receive the error:

Could not load file or assembly 'Microsoft.Rtc.Internal.Media' or one of its dependencies. An attempt was made to load a program with an incorrect format.

I tried compiling the project with CPU set to Any CPU but nothing changes. With both under x64 and x86 setting I receive this error.

Any help is appreciated.

UPDATE: Below is the assembly binding log.

=== Pre-bind state information === LOG: User = CONTOSO\elodie LOG: DisplayName = Microsoft.Rtc.Internal.Media  (Partial) WRN: Partial binding information was supplied for an assembly: WRN: Assembly Name: Microsoft.Rtc.Internal.Media | Domain ID: 9 WRN: A partial bind occurs when only part of the assembly display name is provided. WRN: This might result in the binder loading an incorrect assembly. WRN: It is recommended to provide a fully specified textual identity for the assembly, WRN: that consists of the simple name, version, culture, and public key token. WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information and common solutions to this issue. LOG: Appbase = file:///C:/Users/elodie/Documents/Visual Studio 2010/Projects/TFS/proto/Main/Source/WebBot.Web/ LOG: Initial PrivatePath = C:\Users\elodie\Documents\Visual Studio 2010\Projects\TFS\proto\Main\Source\WebBot.Web\bin Calling assembly : (Unknown). === LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Users\elodie\Documents\Visual Studio 2010\Projects\TFS\proto\Main\Source\WebBot.Web\web.config LOG: Using host configuration file:  LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files/root/e3d82f59/764fa8c3/Microsoft.Rtc.Internal.Media.DLL. LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files/root/e3d82f59/764fa8c3/Microsoft.Rtc.Internal.Media/Microsoft.Rtc.Internal.Media.DLL. LOG: Attempting download of new URL file:///C:/Users/elodie/Documents/Visual Studio 2010/Projects/TFS/proto/Main/Source/WebBot.Web/bin/Microsoft.Rtc.Internal.Media.DLL. ERR: Failed to complete setup of assembly (hr = 0x8007000b). Probing terminated. 

Answer 1

In my case i got this issue because i was running a web project compiled for x64 using IISExpress. I fixed the issue by checking the following setting in Visual Studio:

Tools | Options | Projects and Solutions | Web Projects | Use the 64 bit version of IIS Express

Hope this helps anyone else with this same scenario and issue

Answer 2

I had this problem with ASP.NET IIS and after trying everything, I enabled 32-bit for my app pool and restarted the application pools. Then it worked.

In the IIS7 Manager: Application Pools -> DefaultAppPool -> Advanced Settings -> Set "Enable 32-bit applications" to true.

Also make sure the correct .Net version is selected.

I also set the ISAPI 64bit to allowed under "ISAPI and CGI Restrictions", but I'm not sure if that helped.