Klarna On-site messaging not working for my Prestige theme 10.5.1

Shopify Apps

Topic summary

A user is experiencing issues installing Klarna’s “Add On-Site Messaging” feature on a Shopify store running the Prestige 10.5.1 theme.

Current situation:

  • The Klarna app has been installed and activated in Shopify
  • Changing settings and placements in the theme produces no visible results
  • An error message appears stating: “App block has not been added. There was a problem with the app block. Contact the app developer.”

Seeking help with:

  • Whether others using Prestige 10.5.1 have successfully implemented Klarna On-Site Messaging
  • If the theme has specific blocks or requirements that prevent the app from functioning
  • What additional adjustments might be needed

The issue remains unresolved, with the user requesting community assistance or insights from others who may have encountered similar problems with this theme-app combination.

Summarized with AI on November 1. AI used: claude-sonnet-4-5-20250929.
1

Hi,

I’m trying to install the Klarna app “Add On-Site Messaging” on my Shopify store, but I’m running into issues. I’m using the Prestige 10.5.1 theme, and despite following the installation instructions, it is not working as expected.

  • I have installed and activated the Klarna app in Shopify.
  • I have tried changing settings and placements in the theme but see no changes.
  • Has anyone else using Prestige 10.5.1 managed to get Klarna “Add On-Site Messaging” to work? Is there anything specific in the theme that blocks it or requires additional adjustments?

I am getting this error message:

Skärmavbild 2025-02-12 kl. 06.41.22.png
Skärmavbild 2025-02-12 kl. 06.41.22.png1042×134 18 KB

“App block” has not been added. There was a problem with the app block. Contact the app developer.

Thanks in advance for any help!