As I said in your other thread, while I'm no expert on the COWOA plugin itself, I do know that the zen_create_padss_password() function didn't get introduced until v1.5.1
So the error you're getting means you've added code which depends on v1.5.1 features being present. Why therefore means you've installed a version which is designed for v1.5.1 (whether its author realized it or not when they submitted it).
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