Visual Studio 2015 Getting Method add_PropertyChanged in type Namespace_Accessor from assembley does not have implementation

Hi,

I am working on a webform application which I migrated with Visual Studio 2015 from 4.6.

I am getting the following error

Method 'add_PropertyChanged' in type Namespace_Accessor from assembly does not have an implementation.

I also getting 'The BuildShadowTask task failed unexpectively

I did a search for 'add_PropertyChanged' nothing shows up

The Namespace, I found in the WindowService. WHen I clicked on the Service Reference and when I clicked on any of the property, it takes me to the Reference.cs file. I do

see this in the code

public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

THe class inherits from System.ComponentModel and see the following as part of the interface INotifyPropertyChanged

event PropertyChangedEventHandler PropertyChanged;

I googled this issue and people are getting this error because private accessor are deprecated in 2010 and will not build in 2015.

They say remove private via reflection but I am not sure how to do this.

Any help is greatly appreciate to get this build without this error.

Thanks