After a Veeva Opendata Subscription job completes, an error appears in the Job Error Log section of the Job Details page: Dropped due to singleton job already in progress: [mtx:00000404] Network ID.Job Name/00000176 (Job ID).
This error occurs because the previous job is still running. The same job conflicts if another version of it is currently running. It may prevent Veeva Opendata Subscription from running.
The Admin user needs to reset the previous Subscription job state from Network Commando and run the Subscription again.
To reset the Subscription state, refer to the article in the related documentation section.