Failure adding assembly to the cache

Hi,

A small post about GACUTIL. Currently, i'm building a custom source adapter for SSIS, reading a custom source. For this purpose i'm using Visual Studio Express 2010 C#. So, i am building the assembly and i want to register this in the Global Assembly Cache (GAC) with GACUTIL. So i executed this:

"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\gacutil" /if "C:\ssis\SSISSourceAdapter\SSISSourceAdapter\bin\Release\SSISSourceAdapter.dll"

and this gave me following error:

Failure adding assembly to the cache: This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

So i thought that i should download the .net 4.0 framework SDK released in v7.1 from here . So, i have now three folders in C:\Program Files\Microsoft SDKs\Windows: v6.0A, v7.0A and v7.1. I executed GACUTIL from v7.1 folder and still it didn't work. After some search on the internet, i found out there's a folder in the v7.0A folder: C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools. I executed with this GACUTIL commandline from this subfolder:

"C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\gacutil" /if "C:\ssis\SSISSourceAdapter\SSISSourceAdapter\bin\Release\SSISSourceAdapter.dll"

When i executed GACUTIL from this folder, the insertion was accepted. Not sure why the GACUTIL from v7.1 folder didn't work.

Greetz,
Hennie