Exception in delivering result of invoking 'myServerMethod': Error: [[object Object]]

[kpbird]

I am having following error when I execute "Server Method Example"
I execute Server Method example with insecure and autopublish packages

Exception in delivering result of invoking 'myServerMethod': Error: [[object Object]]
at .extend.livedata_result (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:4625:23)
at onMessage (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:3365:12)
at http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:2734:11
at Array.forEach (native)
at Function..each..forEach (http://localhost:3000/packages/underscore.js?46eaedbdeb6e71c82af1b16f51c7da4127d6f285:149:11)
at self.socket.onmessage (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:2733:11)
at REventTarget.dispatchEvent (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:173:22)
at SockJS._dispatchMessage (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:1158:10)
at SockJS._didMessage (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:1216:18)
at WebSocket.that.ws.onmessage (http://localhost:3000/packages/ddp-client.js?250b63e6c919c5383a0511ee4efbf42bb70a650f:1363:17)