KB174670298: Automation Engine - 'Import imposition failed' Error at Create Imposition from JDF layout

Summary

'Create Imposition from JDF layout': Within the particular or similar Job, some JDF files successfully.

But, seemingly random, some fail referencing a problem with 'Import imposition'.

Symptoms

The log file of the task 'Create Imposition from JDF layout' shows this sort of error:

Delegation task to task Bean.
Waiting for Async update
Async update done
Searching //YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_01.pdf found file://YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_01.pdf
Searching //YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_02.pdf found file://YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_02.pdf
Searching //YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_59.pdf found file://YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_59.pdf
Searching //YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_60.pdf found file://YourFileServer/Jobs/123456.JobA/PDFpages/Sheet.F3/Page_60.pdf
TASK ENDED IN ERROR: Import imposition from 'file://YourFileServer/Jobs/123456.JobA/FLG/impose/123456F3.jdf' failed.
Import imposition from 'file://YourFileServer/Jobs/123456.JobA/FLG/impose/123456F3.jdf' failed.
Import imposition from 'file://YourFileServer/Jobs/123456.JobA/FLG/impose/123456F3.jdf' failed. (ROLLBACK)
com.esko.print.fasttrack.server.interfaces.FastTrackException: Import imposition from 'file://YourFileServer/Jobs/123456.JobA/FLG/impose/123456F3.jdf' failed.

Solution

1. Remove the periods (.) from both the Job folder and folder where the PDF pages are located
2. Regenerate the JDF from 'Preps' 
3. Submit the JDF again.