# About the Commands in mothur category

**URL:** <https://forum.mothur.org/t/about-the-commands-in-mothur-category/15>\
**Category:** Commands in mothur\
**Created:** [September 17, 2009, 4:42pm UTC](https://forum.mothur.org/t/about-the-commands-in-mothur-category/15 "2009-09-17T16:42:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.mothur.org/system/32/2_2.png) [@system](https://forum.mothur.org/u/system)\
**Post date:** [September 17, 2009, 4:42pm UTC](https://forum.mothur.org/t/about-the-commands-in-mothur-category/15/1 "2009-09-17T16:42:34Z")

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Use this forum to address questions about the use of various commands available in mothur

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**Author:** ![fatti](https://avatars.discourse-cdn.com/v4/letter/f/f14d63/32.png) [@fatti](https://forum.mothur.org/u/fatti)\
**Post date:** [April 25, 2019, 3:37pm UTC](https://forum.mothur.org/t/about-the-commands-in-mothur-category/15/2 "2019-04-25T15:37:40Z")

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i’m new at mothur , and i have a error when i run vsearch.command  
mothur \> chimera.vsearch(fasta=stability.trim.contigs.good.unique.filter.unique.precluster.fasta, count=stability.trim.contigs.good.unique.filter.unique.precluster.count\_table, dereplicate=t)

Using 8 processors.  
Checking sequences from stability.trim.contigs.good.unique.filter.unique.precluster.fasta …  
[ERROR]: M00967\_43\_000000000-A3JHG\_1\_2114\_6251\_5508 is not in your count table. Please correct.  
Segmentation fault  
can you help me to resolve this problem??