Ruby on rails Heroku上传JPG错误（ruby on rails）

我最近尝试推到Heroku，只通过添加一个jpg文档来更改我的图像资产。我现在犯了各种奇怪的错误。你们能帮忙吗

remote:        Running: rake assets:precompile
remote:        I, [2015-06-14T01:03:45.686901 #395]  INFO -- : Writing     
               /tmp/build_.../public/assets/....jpg

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事实上，这个问题很容易解决！在推到Heroku之前，只需运行：rake db assets:precompile或类似的内容

从heroku网站登录，找出详细错误，怎么样？事实上，问题很容易解决！在推到Heroku之前，只需运行：rake db assets:precompile或类似的内容。回答下面的问题，这样，如果其他人遇到问题，他们就会知道答案

remote:        Tasks: TOP => assets:precompile
remote:        (See full trace by running task with --trace)
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote: 
remote:  !     Push rejected, failed to compile Ruby app
remote: 
remote: Verifying deploy....
remote: 
remote: !   Push rejected 
remote: 
To https://git.heroku.com/

! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/...git'