# UnsatisfiableError:

**URL:** <https://forum.biobakery.org/t/unsatisfiableerror/2201>\
**Category:** HUMAnN\
**Created:** [June 4, 2021, 9:24am UTC](https://forum.biobakery.org/t/unsatisfiableerror/2201 "2021-06-04T09:24:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Asala\_Mahajna](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/asala_mahajna/32/842_2.png) [@Asala\_Mahajna](https://forum.biobakery.org/u/Asala_Mahajna)\
**Post date:** [June 4, 2021, 9:24am UTC](https://forum.biobakery.org/t/unsatisfiableerror/2201/1 "2021-06-04T09:24:13Z")

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I am getting this error while trying to install Humann 3.0 using CMD:  
"(py37) C:\Users\MWP-WKS050217\>conda install -c biobakery humann  
Collecting package metadata (current\_repodata.json): done  
Solving environment: failed with initial frozen solve. Retrying with flexible solve.  
Solving environment: failed with repodata from current\_repodata.json, will retry with next repodata source.  
Collecting package metadata (repodata.json): done  
Solving environment: failed with initial frozen solve. Retrying with flexible solve.  
Solving environment: -  
Found conflicts! Looking for incompatible packages.  
This can take several minutes. Press CTRL-C to abort.  
failed

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package → Available versions"

Initially, I was using Python 3.9 and then downgraded accordingly to 3.7.7 and I am getting this error. How can I solve it?

Thanks in advance for your help!

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**Author:** ![lauren.j.mciver](https://avatars.discourse-cdn.com/v4/letter/l/f05b48/32.png) [@lauren.j.mciver](https://forum.biobakery.org/u/lauren.j.mciver)\
**Post date:** [June 4, 2021, 7:56pm UTC](https://forum.biobakery.org/t/unsatisfiableerror/2201/2 "2021-06-04T19:56:22Z")

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Hello - It looks like there are conflicts in your conda environment which prevent the humann package from being installed. Would you try creating a new python 3.7 environment and then install HUMAnN. I think this might solve the errors.

Thank you,  
Lauren