I cant install the Klarna app "Add On-Site Messaging" on my Shopify store

Shopify Discussion

Topic summary

A user is unable to install Klarna’s “Add On-Site Messaging” app on their Shopify store running the Prestige 10.5.1 theme. Despite installing and activating the app, they receive an error message stating “App block has not been added. There was a problem with the app block. Contact the app developer.”

Troubleshooting attempts:

  • Changed settings and placements in the theme with no visible results
  • Contacted the app developer but received no response

Current status:

  • The issue remains unresolved
  • At least one other user has reported the exact same problem
  • Users are seeking help from anyone who has successfully implemented this app with the Prestige theme or experienced similar issues
  • Direct appeals to Klarna representatives have been made in the thread
Summarized with AI on October 31. 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:

JustNordic_0-1739362938479.png

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

Thanks in advance for any help!

2

Hi @JustNordic

Have you tried reaching out to the app developer, without the url to your store, they are the best people who can see what is going on.

Regards

3

Yes I have! none of them have answered! It there really no one that has/had the same problem?

Any help would be apprichiated! Thanks

4

Hi,

Same exact issue here.

Have you found any solution?

Many thanks

5

No unfortunatly not. @klarnaut @Klarna , can anyone of you please help out!

Many thanks in advance!