Visual Studio 2015 Error. The default XML namespace of the project must be the MSBuild XML namespace

Question

(Let me preface the question with Yes, I have seen similar questions, but not exactly my scenario.)

My environment is

Microsoft V

Answer 1

Here is my solution, i created new project and i selected .netframework 2.0 or 3.0 then i install the entityframework and its works

Answer 2

This is a bug in EF6.3 which is already fixed and included in 6.4.