# Pix4D Mapper not starting

**URL:** <https://community.pix4d.com/t/pix4d-mapper-not-starting/18219>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [May 23, 2021, 7:57am UTC](https://community.pix4d.com/t/pix4d-mapper-not-starting/18219 "2021-05-23T07:57:37Z")\
**Posts on this page:** 1\
**Showing post:** 15

<div class="post-metadata">

**Author:** ![kpoman](https://avatars.discourse-cdn.com/v4/letter/k/b782af/32.png) [@kpoman](https://community.pix4d.com/u/kpoman)\
**Post date:** [April 27, 2022, 12:37pm UTC](https://community.pix4d.com/t/pix4d-mapper-not-starting/18219/15 "2022-04-27T12:37:32Z")

</div>

Thanks Daniele, it worked. I just changed the env variable PROJ\_LIB to XPROJ\_LIB, restarted computer and it worked. Btw, that variable was created by postgis, which is a postgres extension with QGIS. This may then happen to users of pix4d that are on agriculture mapping.  
Thanks a lot !

---

_[View the full topic](https://community.pix4d.com/t/pix4d-mapper-not-starting/18219)._