# Error in mybinder.org: there is no package called ‘IRkernel’

**URL:** <https://discourse.jupyter.org/t/error-in-mybinder-org-there-is-no-package-called-irkernel/32478>\
**Category:** Binder\
**Tags:** help-wanted\
**Created:** [February 5, 2025, 10:49am UTC](https://discourse.jupyter.org/t/error-in-mybinder-org-there-is-no-package-called-irkernel/32478 "2025-02-05T10:49:18Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![fomightez](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/fomightez/32/495_2.png) [@fomightez](https://discourse.jupyter.org/u/fomightez)\
**Post date:** [February 6, 2025, 1:08pm UTC](https://discourse.jupyter.org/t/error-in-mybinder-org-there-is-no-package-called-irkernel/32478/6 "2025-02-06T13:08:55Z")

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I just looked at a version you had updated 5 minutes ago (this one [here](https://github.com/AstraLabuce/aquainfra-usecase-Daugava/blob/b8b5d2e179d671d6f582fd5b1bc3fe9fa6036d5e/.binder/environment.yml) I believe).  
A couple of things:

- Ideally, do not pin things at the outset. Or at least keep it to minimum. Let conda sort it out. Only pin once you determine a combination that works & only if you are sure you’ll need it. It may be best to at least just record the combination that works so you can recover later if things change out of sync, as sometimes happens.
- I also thought you couldn’t have `defaults` there under channel anymore and have it build completely? [That was the case when I had investigated here](https://discourse.jupyter.org/t/encountering-resource-limits-when-building-binder-from-repo-returned-a-non-zero-code-137/28284/2). Or at least [it is definitely not recommended](https://discourse.jupyter.org/t/fresh-install-of-jupyterlab-from-conda-forge-is-version/20990/2).

You can still install with R if that helps you in your case, too. My repo has an example [where I use an R script to install a library as well](https://github.com/fomightez/SICILIAN-binder/tree/master/binder).

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