Looks like it was fixed by the same methods I have used to fix this error in the past as well:
There was no
endpoint listening at http://domain.com/workflows/PagesApprovalWorkflow.xamlx
that could accept the message. This is often caused by an incorrect address or
SOAP action. See InnerException, if present, for more details.
The WorkflowBaseURL needs to be set to the domain of the
website for example, http://mydomain.com The
property can be found under Administration -> Settings -> Advanced ->
System -> ServicePaths.
You might also need to add your domain and its INTERNAL
IP to the Server’s Hosts File.