Could not load file or assembly 'System.Text.Encoding.CodePages, Version=4.1.2.0

I am getting this error:

An exception of type 'System.IO.FileLoadException' occurred in Neodynamic.SDK.WebClientPrint.dll but was not handled in user code
Additional information: Could not load file or assembly 'System.Text.Encoding.CodePages, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

What I have tried:

1. downloaded sample project

2. Run this file: WebClientPrint3WebFormsCS

3. after adding assemble: neodynamic.sdk.webclientprint.6.0.0 project run successfully but while click on print it gives error:

   An exception of type 'System.IO.FileLoadException' occurred in Neodynamic.SDK.WebClientPrint.dll but was not handled in user code Additional information: Could not load file or assembly 'System.Text.Encoding.CodePages, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

4. After adding latest version of System.Text.Encoding.CodePages 5.0.0 then also it will gives same error of Could not load file or assembly 'System.Text.Encoding.CodePages, Version=4.1.2.0

5. On google I have searched 4.1.2.0, but is not available

6. I have also tried to uninstall and install assembly file, clean build but also showing the same error

Please help if any one has any solution related this.