If you are having trouble accessing the nwa and are using IE9, it may be due to the browser. Set the browser mode to compatibility mode.
The error I received was:
Error: "Application error occurred during the request processing."
Troubleshooting Guide https://sdn.sap.com/irj/sdn/wiki?path=/display/jsts/home
Details: "The WebApplicationException log ID is [005056BC6169008B00000001000015A4]."
It worked for me.