# Fix for KeyError: 'mpa\_mpa\_v30\_CHOCOPhlAn\_201901.tar'

**URL:** <https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421>\
**Category:** MetaPhlAn\
**Created:** [December 10, 2020, 5:35pm UTC](https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421 "2020-12-10T17:35:49Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![timyerg](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/timyerg/32/959_2.png) [@timyerg](https://forum.biobakery.org/u/timyerg)\
**Post date:** [December 10, 2020, 5:35pm UTC](https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421/1 "2020-12-10T17:35:49Z")

</div>

Hello all!  
I installed hopefully the latest version of Metaphlan by running following command:

`conda install -c bioconda python=3.7 metaphlan`

Next, I decided to run Metaphlan with raw reads and got the error:

```
Downloading MetaPhlAn database
Please note due to the size this might take a few minutes

File /home/timyerg/anaconda3/envs/metaphlan/lib/python3.7/site-packages/metaphlan/metaphlan_databases/file_list.txt already present!
Traceback (most recent call last):
  File "/home/timyerg/anaconda3/envs/metaphlan/bin/metaphlan", line 10, in <module>
    sys.exit(main())
  File "/home/timyerg/anaconda3/envs/metaphlan/lib/python3.7/site-packages/metaphlan/metaphlan.py", line 1187, in main
    pars['index'] = check_and_install_database(pars['index'], pars['bowtie2db'], pars['bowtie2_build'], pars['nproc'], pars['force_download'])
  File "/home/timyerg/anaconda3/envs/metaphlan/lib/python3.7/site-packages/metaphlan/metaphlan.py", line 610, in check_and_install_database
    download_unpack_tar(FILE_LIST, index, bowtie2_db, bowtie2_build, nproc)
  File "/home/timyerg/anaconda3/envs/metaphlan/lib/python3.7/site-packages/metaphlan/metaphlan.py", line 463, in download_unpack_tar
    url_tar_file = ls_f["mpa_" + download_file_name + ".tar"]
KeyError: 'mpa_mpa_v30_CHOCOPhlAn_201901.tar'

```

Here I noticed a strange file name in the error: ‘mpa\_mpa\_v30\_CHOCOPhlAn\_201901.tar’.  
So I opened “/home/timyerg/anaconda3/envs/metaphlan/lib/python3.7/site-packages/metaphlan/metaphlan.py” file and edited this code on lines 462-468:

```
tar_file = os.path.join(folder, "mpa_" + download_file_name + ".tar")
    url_tar_file = ls_f["mpa_" + download_file_name + ".tar"]
    download(url_tar_file, tar_file)

    # download MD5 checksum
    md5_file = os.path.join(folder, "mpa_" + download_file_name + ".md5")
    url_md5_file = ls_f["mpa_" + download_file_name + ".md5"]

```

By replacing it with:

```
tar_file = os.path.join(folder, download_file_name + ".tar")
    url_tar_file = ls_f[download_file_name + ".tar"]
    download(url_tar_file, tar_file)

    # download MD5 checksum
    md5_file = os.path.join(folder, download_file_name + ".md5")
    url_md5_file = ls_f[download_file_name + ".md5"]

```

Now database was successfully installed.

I don’t know, maybe I installed not the latest version, and team already fixed it, but if someone encountered the same problem this topic may help him to proceed.

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<div class="post-metadata">

**Author:** ![fbeghini](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/fbeghini/32/81_2.png) [@fbeghini](https://forum.biobakery.org/u/fbeghini)\
**Post date:** [December 11, 2020, 1:21pm UTC](https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421/2 "2020-12-11T13:21:47Z")

</div>

It seems you have installed an older build of MetaPhlAn 3, probably pyh5ca1d4c\_2. This error has been corrected in newer builds, the latest one is version 3.0.7

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<div class="post-metadata">

**Author:** ![timyerg](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/timyerg/32/959_2.png) [@timyerg](https://forum.biobakery.org/u/timyerg)\
**Post date:** [December 11, 2020, 1:36pm UTC](https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421/3 "2020-12-11T13:36:33Z")

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Hi, looks like so.  
Here the output of metaphlan -v  
`MetaPhlAn version 3.0 (25 Feb 2020)`

Just thought that I was using the latest version from bioconda. I should install it from git.  
Thank you for your reply

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<div class="post-metadata">

**Author:** ![Marco\_Severgnini](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.biobakery.org/marco_severgnini/32/1016_2.png) [@Marco\_Severgnini](https://forum.biobakery.org/u/Marco_Severgnini)\
**Post date:** [February 24, 2022, 9:25am UTC](https://forum.biobakery.org/t/fix-for-keyerror-mpa-mpa-v30-chocophlan-201901-tar/1421/4 "2022-02-24T09:25:36Z")

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Hi, I occurred in the same error and was able to resolve thanks to this post.

However, I’m wondering if you plan to update HUMAnN version in `conda` (either via `biobakery` or `bioconda` channels), since for most users it is easier to manage software and dependencies through `conda`.  
Thank you very much.