Usually, this is caused by older templates being used that haven’t been updated in a while. You can either switch to the new templates by renaming your uploads/espresso/templates folder to uploads/espresso/old-templates, or by running a diff between the version of the templates that you used as a basis for your custom templates against the newest version of the templates, and updating your custom templates appropriately. The specific line in the new templates that is probably causing your error is this:
wp_nonce_field('reg_nonce', 'reg_form_nonce');
Adding that to your custom templates will probably fix your error, but you might want to take a look at the new templates for other new features that might have been added.
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