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Problems finding the page tree after upgrade to 9.12.5



I have encountered a problem after a CMS upgrade from 7.19.2 to 9.12.5 in production.

The problem is as follows.
The page tree cannot be found in edit-mode.

The following errors are shown in the console:

In Admin-mode the database information says there are x number of pages in the database (which is correct).
When trying to set access rights in Admin-mode I get the following error:

In Config > Manage websites there is a start page greyed out. When trying to point out a new start page I get the error "An add-on for this website failed to run" and

No errors are shown in the console.
Neither can I remove the current website and create it anew.
The add-ons that are installed are: EPiServer Add-On Store Platform 3.0.1845 and EPiServer Add-On Store UI 3.0.1845

Only in production
Please note that I don't get this error in other environments: not locally, not in dev, not on stage. Only in production.
The only difference between production and i.e. stage is that the Windows versions, IIS versions and SQL Server version differ.

Has anyone encountered this type of problem before or have any suggestions?
Thanks in advance.

Nov 22, 2018 13:14


This is just I wild guess. I remember having problems with edit-mode and the content-tree before. How is you localization-settings in Web.config:

        <localization fallbackBehavior="Echo, MissingMessage, FallbackCulture" fallbackCulture="en">

If you have anything else than "en" for fallbackCulture, try to set it to "en".

Regards Hans

Edited, Nov 22, 2018 14:02

Hi Hans,

Thank you for your suggestion.
Unfortunately it didn't help. Still getting the same errors as mentioned above.

Best regards

Nov 22, 2018 15:32
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