TypeError mime.lookup is not a function when use 'diet-static' as a footer middleware

[tablecell]

var app = server();
app.listen(3000);

var static = require('diet-static')({ path: app.path+'/static/' }) 

console.log( app.path+'/static/' );


// Attach the static module as a footer middleware
app.footer(static)
   

neither http://localhost:3000/jquery.js or http://localhost:3000/static/jquery.js
echo msg TypeError mime.lookup is not a function