No machines available error

Hi,

I'm trying to interpret the following error:

 The job was stopped before the command finished. PAPI error code 5. no machines available

Does this mean no machines were available from the cloud, or that I have an invalid configuration in my WDL?

I've tested my WDL locally and it runs fine. It's available here, if it helps: https://github.com/edawson/bammer/blob/master/bammer.wdl