When doing Msbuild for x64 target cpu "An attempt was made to load an assembly with an incorrect format" error comes

See more:

C#

I am trying to build my solution for 64 bit CPU.
Initially i was facing following build issue

An attempt was made to load an assembly with an incorrect format: C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll.

I was able to fix it using

<GenerateSerializationAssemblies>On</GenerateSerializationAssemblies>
    <SGenToolPath>C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\</SGenToolPath>

Now i am facing the problem that

An attempt was made to load an assembly with an incorrect format: C:\MyFolder\MyProject\obj\release\myproj.dll.

I am unable to understand why this error is coming


Also i can see following warnings
1. Possible problem detected while building assembly myproj: Referenced assembly 'mscorlib.dll' targets a different processor

2. Possible problem detected while building assembly myproj: Referenced assembly 'system.data.dll' targets a different processor

3. Possible problem detected while building assembly myproj: Referenced assembly 'system.web.dll' targets a different processor