我最近几周一直在使用Vapor和Heroku工作，一切进行得很顺利。Vapor真的很棒！；] 我一直都可以成功地使用git push heroku master来更新Heroku上的应用程序，但昨晚开始出现了以下错误：
$ git push heroku master
Counting objects: 26, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (24/24), done.
Writing objects: 100% (26/26), 7.37 KiB | 0 bytes/s, done.
Total 26 (delta 15), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Swift app detected
remote: Cloning into 'swiftenv'...
remote: Swift 3 Heroku Installer
remote: Version: 3.0.2
remote: Operating System: ubuntu1404
remote: Installing Swiftenv
remote: Cloning into '/app/.swiftenv'...
remote: Installing Swift
remote: Downloading https://swift.org/builds/swift-3.0.2-release/ubuntu1404/swift-3.0.2-RELEASE/swift-3.0.2-RELEASE-ubuntu14.04.tar.gz
remote: /tmp/swiftenv-3.0.2- /tmp/build_577666a1ce2003bd1d820e031bc0f306
remote: % Total % Received % Xferd Average Speed Time Time Time Current
remote: Dload Upload Total Spent Left Speed
remote: 100 113M 100 113M 0 0 8057k 0 0:00:14 0:00:14 --:--:-- 8613k
remote: /tmp/build_577666a1ce2003bd1d820e031bc0f306
remote: 3.0.2 has been installed.
remote: ✅ Done
remote: precompile
remote: -----> Installing toolbox
remote: Downloading...
remote: Compiling...
remote: <unknown>:0: error: build had 1 command failures
remote: swift-build: error: exit(1): /app/.swiftenv/versions/3.0.2/usr/bin/swift-build-tool -f /tmp/build_577666a1ce2003bd1d820e031bc0f306/vapor-toolbox/.build/debug.yaml
remote: ! Push rejected, failed to compile Swift app.
remote:
remote: ! Push failed
remote: Verifying deploy....
remote:
remote: ! Push rejected to zzzzzzzz.
remote:
To https://git.heroku.com/zzzzzzzz.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/zzzzzzzz.git'
我的代码库主分支干净且最新，没有来自其他地方的未提交的更改（只是在对代码进行工作）。