`rescue in block (2 levels) in require': There was an error while trying to load the gem 'sass-rails'. (Bundler::GemRequireError)

问题

I finish to install rails 5 at my ubuntu system(16.04.2 LTS) and I'm with this error when I try to run rails server command.

`rescue in block (2 levels) in require': There was an error while trying to load the gem 'sass-rails'. (Bundler::GemRequireError)

Gem Load Error is: uninitialized constant Sass::Script Did you mean? ScriptError

When I write bundle update, the prompt show me this message:

The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.

and then it update well ... and show ~≳ Using sass-rails 5.0.6

Please help-me guys, regards!

来源：https://stackoverflow.com/questions/42683402/rescue-in-block-2-levels-in-require-there-was-an-error-while-trying-to-load