Error while executing assetic dump (parse error: failed at `&:extend(.clearfix all);`)

Question

I was trying to install bootstrap to symfony2. Everything went well until I tried the assetic:dump --force command.

Here\'s my assetic configuration\"

Answer 1

I had the same issue. I resolved it changing the "leafo/lessphp" version in composer.json:

From:

 "leafo/lessphp": "~0.3"

to:

 "leafo/lessphp": "~0.3.9"