The first link is Event Espresso 3 and the second link is Event Espresso 4. The registration flow for the platforms are different as in Event Espresso 4, the ticket selector initiates the start of a registration and then the contact information along with a payment is collected (if applicable) during registration checkout.
On the errors, I tried to check into those for you but there is a maintenance page appearing.
The support post ‘getting errors’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.