I am using visual studio 2017 with Microsoft .NET framework version 4.7 and Entity Framework 6 and SQL Server 2012.
while adding Data source to a Web Form:

I have this error:

I did add Dynamic Data provider for Entity Framework 6 & EntityDataSource control for Entity Framework 6 as a solution proposed on the same question but it didn't work for me and I still have the same problem.
Is there any solution (without the downgrading to Entity Framework 5) ?
And Thanks