# ERROR: Class not defined.

**URL:** <https://forum.toplap.org/t/error-class-not-defined/1466>\
**Category:** Uncategorized\
**Created:** [3 October 2020 15:28 UTC](https://forum.toplap.org/t/error-class-not-defined/1466 "2020-10-03T15:28:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![baka](https://forum.toplap.org/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@baka](https://forum.toplap.org/u/baka)\
**Post date:** [3 October 2020 15:28 UTC](https://forum.toplap.org/t/error-class-not-defined/1466/1 "2020-10-03T15:28:09Z")

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I’m just following the tutorial below. [https://foxdot.org/installation/](https://foxdot.org/installation/)

My environment is macOS 10.14.6, python3.6

I did

1, brew install SuperCollider 3.11.1.

2, pip install FoxDot 0.8.11

3, installed sc3-plugins-3.11.0-macOS.zip from its official page

And I activate SuperCollider and enter `Quarks.install("FoxDot")` then it’s installed successfully. But when I do `FoxDot.start`, it says there is no class defined.

```auto
ERROR: Class not defined.
  in interpreted text
  line 1 char 6:

  DotFox.start 

```

I don’t know why this happens and it takes me hours to know what’s really happening. Any advice will be appreciated.

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<div class="post-metadata">

**Author:** ![nescivi](https://forum.toplap.org/letter_avatar_proxy/v4/letter/n/4da419/32.png) [@nescivi](https://forum.toplap.org/u/nescivi)\
**Post date:** [1 November 2020 10:34 UTC](https://forum.toplap.org/t/error-class-not-defined/1466/2 "2020-11-01T10:34:51Z")

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After the Quark installation, you have to recompile/restart the language for the classes to load.

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<div class="post-metadata">

**Author:** ![jamshark70](https://forum.toplap.org/letter_avatar_proxy/v4/letter/j/47e85d/32.png) [@jamshark70](https://forum.toplap.org/u/jamshark70)\
**Post date:** [10 November 2020 23:22 UTC](https://forum.toplap.org/t/error-class-not-defined/1466/3 "2020-11-10T23:22:36Z")

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Also, for posterity, checking [here](https://github.com/Qirky/FoxDotQuark/blob/master/FoxDot.sc), the name of the class is `FoxDot` – you wrote `DotFox` which is indeed not defined.

hjh