On my Odoo 17 website, from Website -> Editor, I changed the theme to one called theme_scita, which is in Odoo Apps. But now I get this error:

A CSS error occurred, using an old style to render this page. 
Style error: 
Style compilation failed; see the error below. This is an administrator or developer error that must be corrected for the entire database before continuing to work. 

 I've used this theme on other websites and it hasn't given me this error, but it does on this one. If I change the theme back to the default Odoo theme, the error goes away. But how can I fix this so I can have theme_scita?