I've never seen that particular method for embedding a form on a 3rd-party WordPress site. Normally, you would use the API, https://formidableforms.com/knowledgebase/formidable-api/#kb-show-a-form-on-another-wordpress-site.
The JavaScript error you're receiving is because the script is looking for an element with the ID of "ak_js_1". This is not a Formidable generated ID. The injected scipt is not searchable when viewing your page's source code. Whatever the problem is, it's with the script you're embedding from the formfielder site. It needs to be fixed there, or use the API as Formidable's documentation recommends.
document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );
I forgot you could do that with Formidable. Never had a requirement to do this myself. I won't be able to help you with this one.
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