API Autoptimize causes a critical error

Hello everyone. I have a problem with Wordpress. The case concerns the Autoptimize plug. I am trying to add API as recommended:
"Enter your criticalcss API key above. The key is revalidated every time a new job is sent to it.
To obtain your API key, go to criticalcss.com> Account> API Keys. "
Unfortunately, after accepting the changes, a fatal error appears on the page. Maybe any of you use this plugin and have had such a problem? Thank you in advance!

Hi @olgaborek184

Thanks for reaching out to the Zoom Developer Forum!
Are you still experiencing this error on your end?

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