fails to run EPUB validation first time

[GeorgeKerscher]

Steps to reproduce:

Launch the DAISY Pipeline
Start a new job
Select EPUB 3 validation
Give the job a name
deselect Ace validation
Run job
It says error

Rerun job
passes

[bertfrees]

I can not reproduce this.

@GeorgeKerscher Could you please email me your log files (contents of the folder
C:\Users<your_username>\AppData\Roaming\pipeline-ui\engine-logs) when you encounter the error?