swfdotnet library reference issue in vs2010

swfdotnet library reference issue in vs2010

I am creating an windows forms app using vs2010, framework 4.0, C#. I am
adding reference of swfdotnet library's three dll files, include them in
the code, intellisense is also the showing its classes, methods and
properties. But when i run the program it gives following warning and
program doesnt work.
The referenced assembly "SwfDotNet.IO" could not be resolved because it
has a dependency on "System.Web, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a" which is not in the currently targeted
framework ".NETFramework,Version=v4.0,Profile=Client". Please remove
references to assemblies not in the targeted framework or consider
retargeting your project.
Should i need to add some other files. HelP!