Hello,
There are a few things to check in order to begin debugging this issue. First, it sounds like you are running the GenePattern server inside a Docker container. Is that correct? If so, you need to make sure that the container running the server is able to launch and access other containers for the module jobs. You also need to make sure that you have the correct image pulled for the ssGSEA module (genepattern/docker-r-3-2:0.1). Furthermore, you'll need to make sure that the GenePattern sever container and module container are both able to access the /opt/genepattern/taskLib/ directory.
If you're not running the GenePattern server inside a container, things are a bit simpler, as only the host will need the ability to launch containers.
Hopefully this gives you a place to begin debugging. If not, please provide a bit more information about how you're running the GenePattern server and perhaps I can suggest a solution.
Thorin Tabor
GenePattern Team