Getting error when initiating project

[gokulanv]

Cannot read property 'config' of null
TypeError: Cannot read property 'config' of null
at Class.run (/Users/gokulanv/Downloads/angular2-flash-messages-master/node_modules/@angular/cli/tasks/serve.js:51:63)
at check_port_1.checkPort.then.port (/Users/gokulanv/Downloads/angular2-flash-messages-master/node_modules/@angular/cli/commands/serve.js:123:26)
at process._tickCallback (internal/process/next_tick.js:109:7)

I get this error, after doing npm install and tried to do ng serve