Hi, I updated a site on grav from 1.6.x to v1.7.13 (latest) and now I get this “Admin Failed to save entry: %s” error every time when trying to save a page in the admin. Same thing when making a new page and trying to save that. It’s so vague I’m not sure where to start even. Any ideas?
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A good idea is to start with logs 
Maybe something there
I have a feeling it’s related to file permissions. Did you check the upgrade guide?
There was nothing in the logs, but not thinking of checking the upgrade guide was a duh moment haha, thanks! Saving works without issues when I switch back to regular Grav Pages, so it seems something’s not playing nice with the new Flex Objects system.
This topic might help