Configuration of inboundRA in NWA:After updating MaxReaderThreadCount parameter with 5 it is going into RED

Hi Folks

I need to configure IDOC adapter for AAE on PI 7.3. For this I have gone through these links on SCN:

http://scn.sap.com/people/william.li/blog/2011/05/04/configuring-pi-730-java-idoc-adapter 

http://help.sap.com/saphelp_nw73/helpdata/en/C2/91865252C84716B3B8BE394851C9C0/frameset.htm

The issue is that when I change the parameter value for MaxReaderThreadCount to 5 or any other value other than 0.then I saved the changes and press Refresh after that the inboundRA is changed to Red(Not Available) which looks like.

I tried to restart the PI server.

Please give an idea how to fix this issue

Regards

Raja