The chance that you receive this error for the same reason as I may be slim, but I thought I would offer up anyway. If you receive this error, and read the entire error message in the event viewer, it should give an indication of the cause. In my case, this was “no subscribers were found”. Of course I headed to our fried the Subscription Viewer. What I discovered is that when you enlist a dynamic send port, it creates a subscription for every adapter you have registered. In my case I had gotten a little ahead of myself and had deployed a project with an orchestration that made use of a custom adapter that I had registered AFTER deploying the orchestration project. To be safe, I undeployed the orchestration project, registered the adapter, and redeployed the orchestration project. All is good.
Cheers,
Todd