I had an installation of Zen Cart and got the title error. The full message is
Fatal error: Cannot redeclare date_diff() in [store URL]/admin/includes/functions/general.php on line 3001
I googled this and found the FAQ.
I actually think I had 1.3.9, in hindsight. I upgraded to 1.5.0.
I still get the fatal error when trying to access [storename]/admin. What could be happening?
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