Gulp throws an error when modifying a less file?

Question

Less

Welcome all.
Tell me what could be the problem?
Just started using gulp to handle less files.
After running gulp and making changes to the less file, the Potentially unhandled rejection [2] Unrecognized input error occurs in the console. Possibly missing opening '{'
This is the console:

These are the gulpfile settings:

Answer 1

Well, there is an error in less. Open line 1209 /home/rinat/gulp_fun/app/less/style.lessand see where the syntax went wrong.