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I’m a web developer, I just don’t know wordpress, this errors clearly says that rank math is the problem, everything works if I disable it. But I did what you said, disabled every plugin and left only rankmath enabled, still not working.
It works only if it is disabled, I tried rolling back to older both wordpress and rankmath version, still didn’t work.
Also my failing update, I don’t know how to fix it since there is no .maintenance file on my file system(and yes, I do see hidden files).
I can’t think of anything else other than just trying to use a backup, but I don’t have a really recent one(a few days old)…
Or just try to use another SEO plugin(yoast) but really enjoyed rank math until now.
That was the second thing I did after disable the plugin in order to test out..
I did again right now, still not working, but seems that it’s not a fresh one,I will try to remove even all of the settings hoping that it might work, I will let you know.
If you have any ideas…please let me know. Also, I’m using PHP 7.3 is that a problem ?