Archive list is showing but the single Newsletters don’t

[mv]

I installed the archive plugin
made a new page called newsletter-archiv https://wagemut-salon.de/newsletter-archiv/
[newsletter_archive]
all newsletters are listed
but clicking on each single newsletter makes an empty page like https://wagemut-salon.de/newsletter-archiv/?email_id=11

newsletter id 11 should be shown like here: https://wagemut-salon.de/?na=view&id=11

could somebody help me please.

Thanks in advanye

[Stefano]

Clicking on the detail link I can see it from the archive page.

[Author]

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