If you have “permission denied” error when generating css files with compass gem (`initialize': Permission denied @ rb_sysopen) there are two options you can try:

1. Delete all  .sass-cache folders.
2. If the step above didn’t help then try updating compass gem:
   
   Ruby

   gem update sass gem update compass

   1 2	gem update sass gem update compass

While updating gems I faced a problem. This error was displayed:  SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed This is due to recent changes of rubygems.org infrastructure. In order to fix this as official manual says you need to:

1. Download the latest RubyGems
2. Run commands:
   
   C:\>gem install --local C:\rubygems-update-2.6.10.gem C:\>update_rubygems

   1 2	C:\>gem install --local C:\rubygems-update-2.6.10.gem C:\>update_rubygems

That’s is. Everything should work after updating gems!