# biom.exception.BiomParseException: No header line was found in mapping file

**URL:** https://forum.qiime2.org/t/biom-exception-biomparseexception-no-header-line-was-found-in-mapping-file/6487
**Category:** Other Bioinformatics Tools
**Created:** [October 17, 2018, 12:51pm UTC](https://forum.qiime2.org/t/biom-exception-biomparseexception-no-header-line-was-found-in-mapping-file/6487 "2018-10-17T12:51:04Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![thermokarst](https://forum.qiime2.org/letter_avatar_proxy/v4/letter/t/8e7dd6/32.png) [@thermokarst](https://forum.qiime2.org/u/thermokarst)
#### Post date: [February 22, 2019, 12:25am UTC](https://forum.qiime2.org/t/biom-exception-biomparseexception-no-header-line-was-found-in-mapping-file/6487/6 "2019-02-22T00:25:40Z")

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> [@Exporting and modifying BIOM tables (e.g. adding taxonomy annotations)](https://forum.qiime2.org/t/exporting-and-modifying-biom-tables-e-g-adding-taxonomy-annotations/3630):
>
> Creating a TSV BIOM table The following is based on [a post](https://forum.qiime2.org/t/how-to-add-taxonomy-to-feature-table-qza-and-get-otu-id-of-each-taxonomy-and-number-of-otus/3470/22) by @gregcaporaso. $ qiime tools export table.qza --output-dir ./ $ biom convert -i feature-table.biom -o feature-table.tsv --to-tsv $ biom head -i feature-table.tsv # Constructed from biom file #OTU ID L1S105 L1S140 L1S208 L1S257 L1S281 4b5eeb300368260019c1fbc7a3c718fc 2222.0 0.0 0.0 0.0 0.0 fe30ff0f71a38a39cf1717ec2be3a2fc 5.0 0.0 0.0 0.0 0.0 d29fe3c70564fc0f69f2c03e0d1e5561 0.0 0.0 0.0 0.0 0.0 868528ca947bc57b69ffdf83e6b73bae 0.0 2276…

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