# Invalid reference format, help

**URL:** <https://discourse.jupyter.org/t/invalid-reference-format-help/4216>\
**Category:** repo help\
**Created:** [May 1, 2020, 4:07am UTC](https://discourse.jupyter.org/t/invalid-reference-format-help/4216 "2020-05-01T04:07:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kexinhuang12345](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/kexinhuang12345/32/1992_2.png) [@kexinhuang12345](https://discourse.jupyter.org/u/kexinhuang12345)\
**Post date:** [May 1, 2020, 4:07am UTC](https://discourse.jupyter.org/t/invalid-reference-format-help/4216/1 "2020-05-01T04:07:04Z")

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Hey, I want to use Binder for a demo for one of my project. Everything was good but it suddenly returns this error when I opened it today:

Waiting for build to start…  
Picked Git content provider.  
Cloning into ‘/tmp/repo2dockerp4oovtki’…  
HEAD is now at 307bb54 fix small bug  
Using DockerBuildPack builder  
Step 1/5 : FROM node:  
invalid reference format

I tried to refresh but no good. Could you help me what I should do to fix it? Thanks!

> **[GitHub: kexinhuang12345/DeepPurpose/master](https://mybinder.org/v2/gh/kexinhuang12345/DeepPurpose/master)**
>
> Click to run this interactive environment. From the Binder Project: Reproducible, sharable, interactive computing environments.

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**Author:** ![sgibson91](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/sgibson91/32/487_2.png) [@sgibson91](https://discourse.jupyter.org/u/sgibson91)\
**Post date:** [May 1, 2020, 6:23am UTC](https://discourse.jupyter.org/t/invalid-reference-format-help/4216/2 "2020-05-01T06:23:28Z")

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Hi! Looking at your GitHub repo, you are using a Dockerfile to build the environment. This is considered advanced usage of [mybinder.org](http://mybinder.org). Here are some resources:

- Configuration files for Binder: [https://mybinder.readthedocs.io/en/latest/config\_files.html](https://mybinder.readthedocs.io/en/latest/config_files.html)
- Advanced Binder usage: [https://mybinder.readthedocs.io/en/latest/tutorials/dockerfile.html](https://mybinder.readthedocs.io/en/latest/tutorials/dockerfile.html)
- A minimal example of what your Dockerfile needs to be compatible with Binder: [https://github.com/binder-examples/minimal-dockerfile](https://github.com/binder-examples/minimal-dockerfile)

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<div class="post-metadata">

**Author:** ![kexinhuang12345](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/kexinhuang12345/32/1992_2.png) [@kexinhuang12345](https://discourse.jupyter.org/u/kexinhuang12345)\
**Post date:** [May 1, 2020, 1:43pm UTC](https://discourse.jupyter.org/t/invalid-reference-format-help/4216/3 "2020-05-01T13:43:21Z")

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Hey sgibson91,

Thanks! it is now good after deleting the dockerfile (it was accidentally added).