# Tckgen: \[SYSTEM FATAL CODE: SIGSEGV (11)\] Segmentation fault: Invalid memory access

**URL:** https://community.mrtrix.org/t/tckgen-system-fatal-code-sigsegv-11-segmentation-fault-invalid-memory-access/4699
**Category:** Uncategorized
**Created:** [March 24, 2021, 11:19pm UTC](https://community.mrtrix.org/t/tckgen-system-fatal-code-sigsegv-11-segmentation-fault-invalid-memory-access/4699 "2021-03-24T23:19:01Z")
**Posts on this page:** 1
**Showing post:** 4

<div class="post-metadata">

### Author: ![jdtournier](https://community.mrtrix.org/user_avatar/community.mrtrix.org/jdtournier/32/2594_2.png) [@jdtournier](https://community.mrtrix.org/u/jdtournier)
#### Post date: [April 7, 2021, 8:00am UTC](https://community.mrtrix.org/t/tckgen-system-fatal-code-sigsegv-11-segmentation-fault-invalid-memory-access/4699/4 "2021-04-07T08:00:49Z")

</div>

> [@yizhwan](#):
>
> Is there any way to perform SS3T CSD in the latest version of MRTrix. I cannot find this algorithm available hence used: [https://3Tissue.github.io](https://3Tissue.github.io)?

No, this algorithm is not available in MRtrix3 currently, so if you must use it, the only way to do this is what you’ve done: install both versions side by side. See [this post](https://community.mrtrix.org/t/installing-mrtrix3-without-giving-up-mrtrix-2-12/1400/2) for details of how to do this.

---

_[View the full topic](https://community.mrtrix.org/t/tckgen-system-fatal-code-sigsegv-11-segmentation-fault-invalid-memory-access/4699)._