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Merge pull request #131 from nf-core/FAQs_README

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Update usage.md
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Sofia Stamouli 2022-09-14 09:00:17 +02:00 committed by GitHub
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@ -410,3 +410,13 @@ We recommend adding the following line to your environment to limit this (typica
```bash
NXF_OPTS='-Xms1g -Xmx4g'
```
## Troubleshooting and FAQs
### I get a warning during centrifuge_kreport process with exit status 255.
When a sample has insufficient hits for abundance estimation, the resulting `report.txt` file will be empty.
When trying to convert this to a kraken-style report, the conversion tool will exit with a status code `255`, and provide a `WARN`.
This is **not** an error nor a failure of the pipeline, just your sample has no hits to the provided database when using centrifuge.