Hello! I have 2 mistakes after updating to Wordpress 5.0
1) I create a new page. Click 'edit with Pro' blue button
Then this button doesn't work
It works only in the case when I add something to the page via Gutenberg, then click 'edit with Pro".
2) But after that, I see this error
The preview could not load. This is most often related to a plugin conflict or aggressive page cacheing. Checking the developer console for errors could indicate what went wrong.
Could you help me please?