How do I see the actual error that I'm getting?

[Gemma Nash]

Hi there
I've recently upgraded one of my portals to use Bootstrap 5 and Leaflet 1.7.1 and the easyPrint plugin no longer works.
I've tested the code on a simple app and it works fine, so there must be a conflict in my complicated app.
Is there a way I can bypass the 'Oops, something went wrong' and 'Print operation failed' errors? If I comment them out in my local copy, I just get uncaught promise errors with the same Event info in the console.
For info, I'm using the shapemarkers plugin too, but I don't think that's the issue.
Many thanks

[Gemma Nash]

@rowanwins is this plugin still actively supported? I could really use some help.