I used a sample1.zip for confirming the Viewer Builder settings.
The sample1.zip is 4pages data of our magazine.
I built a Built-in Single App with sample1.zip by Viewer Builder correctly.
Then the folio of magazine was ready, I published it and exported magazine.zip.
And I just changed from sample1.zip to magazine.zip, but a Built-in Single App is not built correctly with "Signing Failed".
I deleted the App on the list of Viewer Builder and re-built a Built-in Single App again,
the result is same, "Signing Failed".
I changed from magazine.zip to sample1.zip, Built-in Single App is built correctly.
What is wrong with magazine.zip?