# An error was encountered while running DADA2 in R (return code 1), please inspect stdout and stderr to learn more

**URL:** https://forum.qiime2.org/t/an-error-was-encountered-while-running-dada2-in-r-return-code-1-please-inspect-stdout-and-stderr-to-learn-more/1938
**Category:** User Support
**Tags:** dada2
**Created:** [November 21, 2017, 2:08pm UTC](https://forum.qiime2.org/t/an-error-was-encountered-while-running-dada2-in-r-return-code-1-please-inspect-stdout-and-stderr-to-learn-more/1938 "2017-11-21T14:08:31Z")
**Posts on this page:** 1
**Showing post:** 7

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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: [November 22, 2017, 3:00pm UTC](https://forum.qiime2.org/t/an-error-was-encountered-while-running-dada2-in-r-return-code-1-please-inspect-stdout-and-stderr-to-learn-more/1938/7 "2017-11-22T15:00:12Z")

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Hi @kkcool! It looks like your forward and reverse reads might be identical - please [see this thread](https://forum.qiime2.org/t/import-i-reference-taxonomy-taxonomy-tsv-to-qza/781/27), which was a pretty similar situation. Can you provide some more details about your source data:

- How did you import it? Copy-and-paste your import command, please.
- How is the data formatted before import? Is it demultiplexed? Can you screenshot the folder with your sequences please.
- Have the primers been removed, etc?

Thanks! 🦖

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