Failure message "Process implementation not found" for step DXML Asset Post Processing

Hello,

I have received an error message for a file. It is AEM cloud, Guides version 2406.

Failure message:

Process implementation not found: com.adobe.fmdita.postprocess.PostProcessJobInitiator

Step:

DXML Asset Post Processing

Failure Stack:

com.adobe.granite.workflow.WorkflowException: Process implementation not found: com.adobe.fmdita.postprocess.PostProcessJobInitiator
at com.adobe.granite.workflow.core.job.HandlerBase.executeProcess(HandlerBase.java:207)
at com.adobe.granite.workflow.core.job.JobHandler.process(JobHandler.java:300)
at org.apache.sling.event.impl.jobs.JobConsumerManager$JobConsumerWrapper.process(JobConsumerManager.java:543)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.startJob(JobQueueImpl.java:351)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.access$100(JobQueueImpl.java:60)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl$1.run(JobQueueImpl.java:287)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

I have not received this message for any other files. The message was generated for an earlier version, and the file in question has been checked out/in several times since then without any further messages. There is a warning icon and message in the Assets list display Workflow column for the file and an entry in the Timeline that displays when the error occurred. 

Does anyone know how to resolve this issue or why it would have occurred?

Thanks,

Robin