On a pretty new site, something has happened that has caused articles to give following error message upon saving (on frontend only)
Save failed with the following error: Invalid Parent ID
In search for a solution, I found that one reason for the error is that the category tree structure has gotten messed up for some reason and there seems to be many solutions. I first tried the following:
- Rebuild all menu item
- Rebuild all categories
- Refresh all categories by edit and save/close
- Refresh all articles by edit and save/close
As otherwised explained in this article: https://www.joomla-tips.org/joomla-troubleshooter/save-failed-with-the-following-error-invalid-parent-id.html
Iv'e also tried to create a temporary category and move all categories under it and back to root as explained in this article: https://www.itsupportguides.com/knowledge-base/joomla-tips/joomla-save-failed-with-the-following-error-invalid-parent-id/
However none of this seems to work. It is only when editing or creating articles on frontend I get this error message. Never been a issue when doing the same on backend, where it saves without any error.
Last thing I tried was to install the ACL Manager extension which also has a diagnostic tool to fix issues with assets tables. One was detected with com_category. However fixing it didn't solve it either.
Any help appreciated.