在部署Rails 5应用程序时，出现此错误：
remote: Bundle completed (3.85s)
remote: Cleaning up the bundler cache.
remote: Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.2). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
remote: The latest bundler is 1.16.3, but you are currently running 1.15.2.
remote: To update, run `gem install bundler`
remote: -----> Installing node-v8.10.0-linux-x64
remote: -----> Installing yarn-v1.5.1
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: yarn install v1.5.1
remote: [1/4] Resolving packages...
remote: [2/4] Fetching packages...
remote: info fsevents@1.2.0: The platform "linux" is incompatible with this module.
remote: info "fsevents@1.2.0" is an optional dependency and failed compatibility check. Excluding it from installation.
remote: [3/4] Linking dependencies...
remote: warning "@rails/webpacker > postcss-cssnext@3.1.0" has unmet peer dependency "caniuse-lite@^1.0.30000697".
remote: warning " > webpack-dev-server@2.11.2" has unmet peer dependency "webpack@^2.2.0 || ^3.0.0".
remote: warning "webpack-dev-server > webpack-dev-middleware@1.12.2" has unmet peer dependency "webpack@^1.0.0 || ^2.0.0 || ^3.0.0".
remote: [4/4] Building fresh packages...
remote: Done in 24.80s.
remote: I, [2018-07-31T05:34:58.372842 #459] INFO -- : Writing /tmp/build_e0b626d68337f6bf487c3718057509da/public/assets/placeholder-d28a0c1aa165374509a6d251adb89aa4c9f688dd2da914d199252b60f278a3fd.png
remote: rake aborted!
remote: Uglifier::Error: Unexpected token: name (closeBootstrapDatepicker). To use ES6 syntax, harmony mode must be enabled with Uglifier.new(:harmony => true).
remote: /tmp/build_e0b626d68337f6bf487c3718057509da/vendor/bundle/ruby/2.5.0/gems/uglifier-4.1.10/lib/uglifier.rb:234:in `parse_result'
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我的平台是heroku。我如何解决它？ 该应用程序过去可以很好地部署。