No enabled application monitor is on behalf of queue...

Hello,

I am trying to set up external activation, and the external application doesn't ever seem to be launched.  I get the following error, which shows up in the EATrace.log:


EXCEPTION    ERROR = 32, No enabled application monitor is on behalf of queue [my target queue name].


Any ideas where I should be looking to find the source of the problem?  I'm not sure what it means by 'no enabled application monitor...'

Thanks in advance.