The type or namespace name 'Dynamics' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) issue in Dynamics GP 2015 R2

Error :

         The type or namespace name 'Dynamics' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) issue in Dynamics GP 2015 R2.
 

Solution :

            Step 1:    Change the .Net framework to 4.5.1 and build the project
          Step 2:    Close the application and Reopen Visual Studio to Run as Administrator