symfony: getting error /usr/local/bin/: Permission denied in assetic:dump

Question

My assetic configuration is:

assetic:
debug:          '%kernel.debug%'
use_controller: false
filters:
    less:
     node: /usr/local/bin/
     node_paths: [/usr/local/lib/node_modules]
     apply_to: '\.less$' 

when I run command bin/console assetic:dump then I am getting below error:

[Assetic\Exception\FilterException]
An error occurred while running:
'/usr/local/bin/' '/tmp/assetic_lessgyMQtZ'
Error Output:
sh: 1: /usr/local/bin/: Permission denied