What does WordPress not like about less?

Question

PHP

good afternoon.
after frauds on the site unknown to me (presumably, they tried to do something harmless on an overcrowded hosting, and due to overcrowding, some files were auto-replaced), the WordPress site stopped entering the admin panel - writes

lessphp fatal error: expected color value: failed at `-groups.less";` /home/aqq****/public_html/mydomen/wp-content/themes/theme52658/bootstrap/less/bootstrap.less on line 37
Warning : Cannot modify header information - headers already sent by (output started at /home/aqq****/public_html/mydomen/wp-content/themes/CherryFramework/includes/less-compile.php:309) in /home/aqq ****/public_html/mydomain/wp-includes/pluggable.php on line 1196

and a line appeared on the top of the site

lessphp fatal error: expected color value: failed at `-groups.less";` /home/aqq****/public_html/mydomen/wp-content/themes/theme52658/bootstrap/less/bootstrap.less on line 37

I get into the indicated 37th line - there is this:

@import "button-groups.less";

that is, the problem is in the import ...
besides the backup, is there a way to unravel manually? backup - as an option, but last of all, maybe you will have to sacrifice many changes ..
the joke is that I scored the error line in Google - I saw that such errors, with this description, are all the time. But I didn't see any solution. I decided that since it often occurs, it can be treated somehow easily.

Answer 1

Comment out this line temporarily and try again.
// @import "button-groups.less";