在Play项目上将Sbt-less从1.0.6更新到1.1.0后，当我尝试git push heroku master时收到此错误输出：
remote: [error] TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [info]
remote: [error] TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [info]
remote: [error] TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [info]
remote: [error] TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [info]
remote: [error] TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [info]
remote: com.typesafe.sbt.jse.SbtJsTask$JsTaskFailure: TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: at module.js:456
remote: at module.js:474
remote: at module.js:356
remote: at module.js:312
remote: at module.js:364
remote: at require (module.js:380)
remote: at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: at module.js:456
remote: at module.js:474
remote: at module.js:356
remote: at module.js:312
remote: at module.js:364
remote: at require (module.js:380)
remote: at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: at module.js:456
remote: at module.js:474
remote: at module.js:356
remote: at module.js:312
remote: at module.js:497
remote: at startup (trireme.js:142)
remote: at trireme.js:923
remote:
remote: at com.typesafe.sbt.jse.SbtJsTask$$anonfun$com$typesafe$sbt$jse$SbtJsTask$$executeJsOnEngine$1.apply(SbtJsTask.scala:195)
remote: at com.typesafe.sbt.jse.SbtJsTask$$anonfun$com$typesafe$sbt$jse$SbtJsTask$$executeJsOnEngine$1.apply(SbtJsTask.scala:167)
remote: at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
remote: at scala.util.Try$.apply(Try.scala:161)
remote: at scala.util.Success.map(Try.scala:206)
remote: at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
remote: at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
remote: at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
remote: at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
remote: at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
remote: at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
remote: at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
remote: at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
remote: [error] (web-assets:less) com.typesafe.sbt.jse.SbtJsTask$JsTaskFailure: TypeError: [object Object] is not a function, it is object. (/tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js#4) at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less/index.js:4
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/lib/less-node/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/node-modules/webjars/less/index.js:1
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:364
remote: [error] at require (module.js:380)
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:14
remote: [error] at /tmp/scala_buildpack_build_dir/project/target/less/sbt-less-1.1.0.jar:3
remote: [error] at module.js:456
remote: [error] at module.js:474
remote: [error] at module.js:356
remote: [error] at module.js:312
remote: [error] at module.js:497
remote: [error] at startup (trireme.js:142)
remote: [error] at trireme.js:923
remote: [error] Total time: 5 s, completed Mar 11, 2016 3:18:15 AM
remote:
remote: ! ERROR: Failed to run sbt!
remote: We're sorry this build is failing. If you can't find the issue in application
remote: code, please submit a ticket so we can help: https://help.heroku.com
remote: You can also try reverting to the previous version of the buildpack by running:
remote: $ heroku buildpacks:set https://github.com/heroku/heroku-buildpack-scala#previous-version
remote:
remote: Thanks,
remote: Heroku
remote:
remote:
remote: ! Push rejected, failed to compile Play 2.x - Scala app
remote:
remote: Verifying deploy...
remote:
remote: ! Push rejected to vetpros-stage.
remote:
To https://git.heroku.com/vetpros-stage.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/vetpros-stage.git'
项目本身在我编码的机器上工作正常。我试过heroku run "sbt clean-files"似乎没有效果。我在某处读到删除/target文件夹也可能有所帮助，但是当我尝试从 Heroku 的 bash 终端中删除它们时，它不会进行更改。任何建议都会有所帮助，提前感谢您！
编辑：我想出了一个解决方法，相当明显（你们中的许多人可能已经知道），但是每次上传到Heroku时，您可以简单地恢复到无sbt的1.0.6。很烦人，但至少它完成了工作。
尝试通过设置以下命令运行干净的构建：
$ heroku config:set SBT_CLEAN="true"
然后重新部署应用。
heroku run 命令在与应用程序隔离的单独容器中运行，并且不会永久修改文件系统（即 slug 映像）。
我在本地遇到了同样的问题，诀窍不仅是（不仅？）删除target文件夹，而且还project/target（甚至可能是project/project，但这在我的情况下不是必需的）。
也许如果您尝试从 Heroku 的 bash 终端中删除它们，它也适合您。
（我从无 sbt 项目的问题 #68（LESS 编译失败并出现异常）中获得了此解决方案。