Tasks starting... never finishes



I am using the crops/toaster-container from https://github.com/crops/toaster-container
I followed the README for running the container. There is nothing particular about my setup. 

In the "All Builds" section of the web app I am seeing this: 

For the past hour.

What's the best way to get started debugging?

build-toaster-2/toaster-ui.log shows a handled exception : 

Traceback (most recent call last):
  File "/home/usersetup/poky/bitbake/bin/bitbake", line 38, in <module>
  File "/home/usersetup/poky/bitbake/lib/bb/main.py", line 383, in bitbake_main
  File "/home/usersetup/poky/bitbake/lib/bb/ui/toasterui.py", line 148, in main
    result, error = server.runCommand(["setEventMask", server.getEventHandle(), llevel, debug_domains, _evt_list])
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1112, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1452, in __request
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1154, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1170, in single_request
    return self.parse_response(resp)
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1342, in parse_response
    return u.close()
  File "/usr/lib/python3.6/xmlrpc/client.py", line 656, in close
    raise Fault(**self._stack[0])
xmlrpc.client.Fault: <Fault 1: "<class 'bb.BBHandledException'>:">


Also, it doesn't look like it's trying hard enough ....