This block has encountered an error and cannot be previewed

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I am trying to understand how to setup a subscription form on my wordpress post. I click on the block editor and I see a mailpoet icon. I click on it to add it in a block and I get an error message: “This block has encountered an error and cannot be previewed”

This is all new to me. A while ago I upgraded from Mailpoet 2 to Mailpoet 3. I’m trying to re-create the old forms to like to new email lists. Maybe I am not doing this corretly? Any tips?
Thanks,
Chris

 

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