Select PDF broken.... again DEV MODE

While resuming work on printout from our app, today SelectPDF is on the blink ??? in DEVMODE
why ?? I thought the licence had expired, but it’s not that. It’s just throwing this unhelpful error

No changes made to the workflow either…
I have run the live app and the plugin works fine there, so this bug is happening on the Editor / Development mode…

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RESOLVED
SelectPDF people responded: The error is Authentication Error. Make sure the page is anonymously accessible.

I had reset the app’s privacy To “Limit access to this app with a username and password”,
but indoing so the SelectPDF plugin doesnt work in Devmode when in this mode