heroku git push heroku masterが拒まれた話

#herokuを使ってデプロイ

herokuを使ってデプロイをしようとしたところ

$git push heroku master


remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !	Push rejected to muji-app-copy.
remote: 
To https://git.heroku.com/****.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/***.git'
***noMacBook-Pro:*** ***$ bundle install
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`.
Using rake 12.3.2

との事、、、

調べると以下を実行すれば通るとの事だが

$ bundle install --without production
$ git commit -a -m "Update gemfile.lock for heroku"
$ heroku create
$ git push heroku master```

remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !	Push rejected to muji-app-copy.
remote: 
To https://git.heroku.com/****.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/***.git'
***noMacBook-Pro:*** ***$ bundle install
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`.
Using rake 12.3.2

しかし結果は変わらず、、、

エラー文を見てみると

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.

とのメッセージが

$ bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java
$ git commit -a -m "change　gemfile.lock for heroku"
$ heroku create
$ git push heroku master

を実行してみると、、、通った！！

###まとめ

$ heroku logs

などをしてエラーメッセージ、ログをしっかり読む！！

###追記

$ rake assets:precompile

も役立つ！！