SQL Server “version, culture or public key mismatch” during “create assembly” when loading XMLSerializers created with sgen utility

Question

I'm trying to create a CLR function in SQLServer that calls a web service. When I create the first assembly, the AssemblyVersion in AssemblyInfo.cs is 1.0.*. I'll run sgen to create the accompanying XMLSerializers assembly, and I don't see any problems there.

>"C:\Program Files\Microsoft SDKs\Windows\v7.0\Bin\sgen.exe" /force /assembly:Ra
elen.DemoCLRFunction.dll
Microsoft (R) Xml Serialization support utility
[Microsoft (R) .NET Framework, Version 2.0.50727.3038]
Copyright (C) Microsoft Corporation. All rights reserved.
Serialization Assembly Name: Raelen.DemoCLRFunction.XmlSerializers, Version=1.0.
3868.13304, Culture=neutral, PublicKeyToken=null.
Generated serialization assembly for assembly C:\dev\freight-workspace\Raelen.De
moCLRFunction\Raelen.DemoCLRFunction\bin\Debug\Raelen.DemoCLRFunction.dll --> 'C
:\dev\freight-workspace\Raelen.DemoCLRFunction\Raelen.DemoCLRFunction\bin\Debug\
Raelen.DemoCLRFunction.XmlSerializers.dll'.

In SQLServer, the first assembly loads fine, but I'm getting the following error trying to load the XMLSerializers assembly:

Msg 10300, Level 16, State 2, Line 7
Assembly 'Raelen.DemoCLRFunction.XmlSerializers' references assembly 
'raelen.democlrfunction, version=0.0.0.0, culture=neutral, publickeytoken=null.',
which is not present in the current database. SQL Server attempted to locate and
automatically load the referenced assembly from the same location where 
referring assembly came from, but that operation has failed (reason: version, 
culture or public key mismatch). Please load the referenced assembly into the 
current database and retry your request.

I can't figure out why it's trying to reference version 0.0.0.0. Is that indeed the cause of the error, and if so, why is the XMLSerializers assembly referencing the wrong version number?

Answer 1

I had this problem and I eventually worked it out. I was referencing an x86 assembly on a 64 bit server. I rebuilt the referenced assembly as Any CPU, installed in on the server, re-added the reference to the project, rebuilt my project as Any CPU, and then SQL Server could resolve the reference and install the assembly.

A message along the lines of "You're referencing an assembly that's built for the wrong platform" would have been rather useful :)

Answer 2

If you are running x64 SQL server check if your project build target to the Any CPU platform. I have encountered the same problem and made the following table;

A1 the referenced assembly; A2 references.

A1 \ A2   x86   x64   Any CPU
x86        X     V     X
x64        V     V     V
Any CPU    V     V     V