Error generate css

Hello,

It appears a message:

“Failed to generate critical CSS
Um, looks like something’s gone wrong. We are still seeing an unexpected error. Please contact our support for help.

hide error message
It appears that this page does not contain any relevant CSS in its external stylesheet(s):
https://comprarunlavavajillas.com/
To do
Follow the troubleshooting steps below for the page.
1
Visit the page.
2
Verify that the styles are loaded correctly and try again.”

How can I solve it?

Thanks.

The page I need help with: [log in to see the link]