SOLVED erpnext can not find variables.less

the error :

19:06:15 watch.1          | Error compiling  erpnext.less

19:06:15 watch.1          | { [Error: 'variables.less' wasn't found. Tried - variables.less,/home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less,/home/frappe/frappe-bench/sites/node_modules/variables.less,variables.less]

19:06:15 watch.1          |   message: '\'variables.less\' wasn\'t found. Tried - variables.less,/home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less,/home/frappe/frappe-bench/sites/node_modules/variables.less,variables.less',

19:06:15 watch.1          |   stack: undefined,

19:06:15 watch.1          |   type: 'File',

19:06:15 watch.1          |   filename: 'erpnext.less',

solutions :

find . -iname variables.less

then copy the file to one of those location, example  :

frappe@ubuntu:~$ cp frappe-bench/apps/frappe/frappe/public/less/variables.less /home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less

then bench start 

..show all:.

.

the error :

19:06:15 watch.1          | Error compiling  erpnext.less

19:06:15 watch.1          | { [Error: 'variables.less' wasn't found. Tried - variables.less,/home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less,/home/frappe/frappe-bench/sites/node_modules/variables.less,variables.less]

19:06:15 watch.1          |   message: '\'variables.less\' wasn\'t found. Tried - variables.less,/home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less,/home/frappe/frappe-bench/sites/node_modules/variables.less,variables.less',

19:06:15 watch.1          |   stack: undefined,

19:06:15 watch.1          |   type: 'File',

19:06:15 watch.1          |   filename: 'erpnext.less',

solutions :

find . -iname variables.less

then copy the file to one of those location, example  :

frappe@ubuntu:~$ cp frappe-bench/apps/frappe/frappe/public/less/variables.less /home/frappe/frappe-bench/apps/erpnext/erpnext/public/less/variables.less

then bench start