Inline forms and pop-up forms made directly in accounts won't work on Wordpress sites, because outside javascripting isn't allowed. Only forms explicitly made through the Wordpress integration will work on sites made in their builder.
If this error is showing for a form made in the Wordpress integration / plugin, then I'd advise calling our general support to request a transfer to the Tier 2 integrations team, or reaching out via the integration's support page on Wordpress.
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