Describe the bug
After following the instructions in the README of the Next app router example, live preview was not working in Contentful. I only saw the error mentioned in the title.
Solution
In my case, I had to add the target origin to the provider. Consider adding this to the README.

Side note
It would be great to have an additional step after "Step 5. Running the project". Maybe you could explain just shortly that we're supposed to open the content entry, click the live preview button, and then can change the content. Just felt like this is missing for the guide to be complete
Describe the bug
After following the instructions in the README of the Next app router example, live preview was not working in Contentful. I only saw the error mentioned in the title.
Solution
In my case, I had to add the target origin to the provider. Consider adding this to the README.
Side note
It would be great to have an additional step after "Step 5. Running the project". Maybe you could explain just shortly that we're supposed to open the content entry, click the live preview button, and then can change the content. Just felt like this is missing for the guide to be complete