Predefined type microsoft.csharp.runtimebinder is not defined or imported

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C#

I'm using the dynamic keyword in my C# project. I get the below error

"One or more types required to compile a dynamic expression cannot be found".

Below is my code and we are using VS 2013 with .NET Framework 4.5.1

dynamic cstmDocProp = (Microsoft.Office.Core.DocumentProperties)mScribeShell.ScribeShell.ActiveWordDoc.CustomDocumentProperties;  
string s = String.Empty;
s = Convert.ToString(cstmDocProp[mConstants.g_sPROPERTY_DOCUMENT_INDEX].Value);

I have already referred Microsoft.Chasharp DLL and System.Core DLL as suggested in other links.

After referring Microsoft.Csharp DLL I'm getting another error as "predefined type microsoft.csharp.runtimebinder is not defined or imported".

Kindly suggest.

Thanks