X and PRO have a native Global Block feature now, so we advise to deactivate that plugin to avoid conflict.
Even if you're having that error on the old Global Blocks, you can still save it as a template (see what I did to Fire Notice block)
Then navigate to Pro > Global Blocks create a new Global Blocks (correspond to the old blocks) and load the template that you saved.
You can add your new Global Blocks to a page by using the shortcode or the Global Blocks Element.
Hope that helps,