LESS styles are not compiled. How to see the error?

Question

css

At some point, LESS files stopped compiling, I tried to roll back to the previous “working” moment, but to no avail. There are no styles on the page (including the bootstrap, which worked fine before): XHR requests (compiler - client) to fifty files are processed successfully, no 404s. I tried to comment out my code completely, but the styles still did not compile. I hope for help, since the subject does not show any errors.

Answer 1

Here's what I dug up. github.com/cloudhead/less.js/blob/master/dist/less-1.3.0.js#L3107
You can add your host here, thereby activating the development env and see where the error is. Well, or another condition, for example, some hash that only you will know :)

Answer 2

lesscss.org/#-client-side-usage
"To enable it, append '#!watch' to the browser URL, then refresh the page. alternatively, you can run less.watch() from the console."
Isn't it?