The Debugging problem in NWDS

Hi GURU,

i am trying to debug my application in nwds 7.3.

While configuring the debug configuration, on runtime tab its giving me a error like " No debuggable node available. Open a debug session in SAP Management Console first"

I started debug session in MMC, and when i check the sessions in MMC my session is not available, and also its throwing an error as below

i am wondering why all this errors are coming, some one help me on this.

And i also set the

Debuggable: true

Debug mode : false       in config tool.

Some one please help me on this.