# Intermittend build failure on CI (Windows)

**URL:** <https://discuss.emberjs.com/t/intermittend-build-failure-on-ci-windows/14482>\
**Category:** Ember CLI\
**Created:** [April 4, 2018, 9:57am UTC](https://discuss.emberjs.com/t/intermittend-build-failure-on-ci-windows/14482 "2018-04-04T09:57:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![bouke](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/bouke/32/16341_2.png) [@bouke](https://discuss.emberjs.com/u/bouke)\
**Post date:** [April 4, 2018, 9:57am UTC](https://discuss.emberjs.com/t/intermittend-build-failure-on-ci-windows/14482/1 "2018-04-04T09:57:12Z")

</div>

On our Windows (Server 2016) CI build server, we see intermittent build failures like these:

```auto
[5/5] Building fresh packages...
Done in 175.06s.
node_modules\.bin\ember.cmd build --output-path ..\(...)\ --environment=development

Running without permission to symlink will degrade build performance.
See http://ember-cli.com/user-guide/#windows for details.

09:15:33 - Starting compilation in watch mode...

09:15:37 - Compilation complete. Watching for file changes.
cleaning up...
Cleanup error.
ENOTEMPTY: directory not empty, rmdir 'C:\VSTS\_work\32\s\(...)\tmp\funnel-output_path-Qcu26lv4.tmp'

```

I’m not quite sure what to make of this, as a subsequent build doesn’t run into the same issue. We’re using `ember-cli-typescript`, but I don’t know if that’s any relevant. We’re on `ember-cli` 3.0. Does anyone have any pointers on how to resolve this issue?