# Demux quits with plugin error: no Sequences mapped

**URL:** <https://forum.qiime2.org/t/demux-quits-with-plugin-error-no-sequences-mapped/1269>\
**Category:** User Support\
**Tags:** emp, demux\
**Created:** [September 18, 2017, 7:06pm UTC](https://forum.qiime2.org/t/demux-quits-with-plugin-error-no-sequences-mapped/1269 "2017-09-18T19:06:24Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![jairideout](https://forum.qiime2.org/user_avatar/forum.qiime2.org/jairideout/32/9_2.png) [@jairideout](https://forum.qiime2.org/u/jairideout)\
**Post date:** [September 19, 2017, 3:18am UTC](https://forum.qiime2.org/t/demux-quits-with-plugin-error-no-sequences-mapped/1269/3 "2017-09-19T03:18:24Z")

</div>

Hi @saatkinson! It looks like your barcodes and sequences files got swapped when you imported them into `iowa_seqs.qza`. In other words, `barcodes.fastq.gz` contains your sequences, and `sequences.fastq.gz` contains your barcodes. I verified this by exporting your multiplexed data with `qiime tools export` and inspecting the two `.fastq.gz` files with the `less` command.

Can you try re-importing your multiplexed data after you swap those filenames around?

---

_[View the full topic](https://forum.qiime2.org/t/demux-quits-with-plugin-error-no-sequences-mapped/1269)._