Error message "responsive-utilities.less" not found I did set-up the sub-theme with less for the Bootstrap theme.
Following is the file structure,


  


Installed less using(Instruction followed from here),

$ npm install -g less


Then ran a following code to activate less,

$ lessc styles.less styles.css


Then following error shown,

Error message:

FileError: '../bootstrap/less/responsive-utilities.less' wasn't found.

Complete message as below.

FileError: '../bootstrap/less/responsive-utilities.less' wasn't found. Tried - /Applications/MAMP/htdocs/drupal7114/sites/all/themes/lsubtheme/bootstrap/less/responsive-utilities.less,/Applications/MAMP/htdocs/drupal7114/sites/all/themes/lsubtheme/bootstrap/less/responsive-utilities.less,../bootstrap/less/responsive-utilities.less in /Applications/MAMP/htdocs/drupal7114/sites/all/themes/lsubtheme/less/bootstrap.less on line 61, column 1:
60 @import "../bootstrap/less/utilities.less";
61 @import "../bootstrap/less/responsive-utilities.less";
62


What could be the reason for this error? Any idea? Thanks
Found the issue, actually it was my fault, I missed to paste the Bootstrap source file in the sub-theme folder. Because responsive-utilities.less is coming from /bootstrap/less/responsive-utilities.less as you can see in error message. Hence, previously bootstrap was missing, so this was error did appear.