You did not read them all, you missed the important one that tells you exactly what the problem is and how to fix it... I will assume you are asking about v2.2.0.0 since you did not give that information.
Solution for "error undefined" message in V2.2.0.0
No need to pay but donations are always welcome...
NEVER take serious; anyone who gives negative impact statements with no ABSOLUTE proof!
OpenCart Helpful Information * Upgrade 1.5 to 2.1 * Upgrade 2.1 to 2.2
"Why do people NEVER have enough time to do it right but ALWAYS enough time to do it over?"
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That is basically the whole purpose of HTTPS for payment systems or other sensitive data.
What exactly do you mean?
NEVER take serious; anyone who gives negative impact statements with no ABSOLUTE proof!
OpenCart Helpful Information * Upgrade 1.5 to 2.1 * Upgrade 2.1 to 2.2
"Why do people NEVER have enough time to do it right but ALWAYS enough time to do it over?"
DO NOT EVER GIVE SOMEONE YOU DON"T KNOW ADMIN ACCESS TO ANYTHING!
I am NOT affiliated with OpenCart
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