# Segmentation fault: 11 in macbook
**URL:** https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995
**Category:** Uncategorized
**Created:** [June 28, 2019, 9:48am UTC](https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995 "2019-06-28T09:48:26Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@anusharai](https://forum.mothur.org/u/anusharai)
#### Post date: [June 28, 2019, 9:48am UTC](https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995/1 "2019-06-28T09:48:26Z")
Hi,
I am using Mothur in MacBook.
After the filtering of the sequences, when I am proceeding for unique.seqs, I am getting “Segmentation fault: 11”. Same files when I am processing in the Dell laptop, it runs smoothly. Does it have to do with the system or is it due to error in sequences.
Kindly enlighten.
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### Author:  [@pschloss](https://forum.mothur.org/u/pschloss)
#### Post date: [July 2, 2019, 5:35pm UTC](https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995/2 "2019-07-02T17:35:02Z")
Could you try downloading the new version of mothur we posted - [1.42.3](https://github.com/mothur/mothur/releases/latest) and try again?
Thanks,
Pat
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### Author:  [@pschloss](https://forum.mothur.org/u/pschloss)
#### Post date: [July 3, 2019, 5:14pm UTC](https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995/3 "2019-07-03T17:14:21Z")
Sorry - can you try again - we just reposted the correct 1.42.3 executable this morning.
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### Author:  [@anusharai](https://forum.mothur.org/u/anusharai)
#### Post date: [July 4, 2019, 11:31am UTC](https://forum.mothur.org/t/segmentation-fault-11-in-macbook/19995/4 "2019-07-04T11:31:08Z")
Thank you so much!
Will try and let you know.