Hello guys! I am learning Middleman, but I had problem to start it. When I type “bundle exec middleman” in my project folder, it show an error like this:
vagrant@vagrant-ubuntu-trusty-64:~$ cd /web-site/
vagrant@vagrant-ubuntu-trusty-64:/web-site$ bundle exec middleman --force-polling
/var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt/template.rb:144:in require': cannot load such file -- less (LoadError) from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt/template.rb:144:in require_template_library’
from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt/css.rb:59:in initialize_engine' from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt/template.rb:56:in initialize’
from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt.rb:98:in new' from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt.rb:98:in block in []’
from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt.rb:96:in each' from /var/lib/gems/2.2.0/gems/tilt-1.4.1/lib/tilt.rb:96:in []’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:322:in strip_extensions' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:310:in record_file_change' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:257:in block in update' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:256:in each’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:256:in update' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources/source_watcher.rb:204:in poll_once!' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources.rb:239:in block in poll_once!' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources.rb:239:in each’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources.rb:239:in reduce' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/sources.rb:239:in poll_once!’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/core_extensions/file_watcher.rb:50:in before_configuration’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/callback_manager.rb:57:in instance_exec’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/callback_manager.rb:57:in block in execute' from /var/lib/gems/2.2.0/gems/hamster-3.0.0/lib/hamster/vector.rb:1316:in each’
from /var/lib/gems/2.2.0/gems/hamster-3.0.0/lib/hamster/vector.rb:1316:in traverse_depth_first' from /var/lib/gems/2.2.0/gems/hamster-3.0.0/lib/hamster/vector.rb:431:in each’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/callback_manager.rb:57:in execute' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_reference.rb:43:in send_to’
from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/call_with.rb:76:in call_with' from /var/lib/gems/2.2.0/gems/contracts-0.13.0/lib/contracts/method_handler.rb:138:in block in redefine_method’
from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/callback_manager.rb:28:in block in install_methods!' from /var/lib/gems/2.2.0/gems/middleman-core-4.1.6/lib/middleman-core/application.rb:281:in initialize’
from /var/lib/gems/2.2.0/gems/middleman-cli-4.1.6/bin/middleman:48:in new' from /var/lib/gems/2.2.0/gems/middleman-cli-4.1.6/bin/middleman:48:in <top (required)>’
from /usr/local/bin/middleman:23:in load' from /usr/local/bin/middleman:23:in ’
vagrant@vagrant-ubuntu-trusty-64:/web-site$
I would be very grateful if somebody can help me with this. Btw, I am using Linux Ubuntu.