# Cannot Merge Projects After Update.

**URL:** <https://community.pix4d.com/t/cannot-merge-projects-after-update/5313>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [March 28, 2016, 2:59am UTC](https://community.pix4d.com/t/cannot-merge-projects-after-update/5313 "2016-03-28T02:59:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Shelia\_Williams](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@Shelia\_Williams](https://community.pix4d.com/u/Shelia_Williams)\
**Post date:** [March 28, 2016, 2:59am UTC](https://community.pix4d.com/t/cannot-merge-projects-after-update/5313/1 "2016-03-28T02:59:16Z")

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After upgrading to the new version of Pix4D, I am unable to merge one or more projects together. I get an error message saying that the output coordinates are not the same even though they are. I have tried to change to different coordinate systems and even tried making the GCP and output coordinate system arbitrary in one of the projects being merged. Is anyone else having this problem, or know how to fix it?

Thanks,

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**Author:** ![Julie\_Pichon](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/julie_pichon/32/592_2.png) [@Julie\_Pichon](https://community.pix4d.com/u/Julie_Pichon)\
**Post date:** [April 7, 2016, 2:56pm UTC](https://community.pix4d.com/t/cannot-merge-projects-after-update/5313/2 "2016-04-07T14:56:35Z")

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Hi Shelia,

Given the error message, have you made sure the output coordinate are the same?  
Here is more information about merging subprojects: [https://support.pix4d.com/hc/en-us/articles/202558529](https://support.pix4d.com/hc/en-us/articles/202558529)  
To edit the coordinate system of the output I recommended that you use this article: [https://support.pix4d.com/hc/en-us/articles/202558099](https://support.pix4d.com/hc/en-us/articles/202558099)

Regards,