express js error : "express deprecated res.sendfile: Use res.sendFile instead"

Change this

 app.get('/',function(req, res){//get,put,post,delete   
      res.sendfile(__dirname + '/client/views/index.html');
    });

to this and this should work.

app.get('/',function(req, res){//get,put,post,delete   
      res.sendFile(__dirname + '/client/views/index.html');
    });

In new versions sendfile has been deprecated. Change sendfile to sendFile.