Lakshmanamurthy,
I suspect this blocked queue is left over from a previous error unrelated to your current model activation. It looks like an error that is related to a previous production order CIF that went wrong.
If you are in a dev system, and you don't know why the error exists, just try deleting the errored queue and then re-attempt your new activation. You can solve the 'supplying plant' problem if/when it re-occurs.
If you are in a prod system, then you need to open the blocked queue and find out what the problem is. It is generally easiest to display and manage all queues using SCM transaction /SAPAPO/CQ. Here you can display and manage inbound and outbound queues for both ECC and SCM.
Best Regards,
DB49