# Merging Projects Error: No Cameras/not enough 3D points
**URL:** https://community.pix4d.com/t/merging-projects-error-no-cameras-not-enough-3d-points/7419
**Category:** PIX4Dmapper Questions/Troubleshooting
**Created:** [October 22, 2018, 2:52pm UTC](https://community.pix4d.com/t/merging-projects-error-no-cameras-not-enough-3d-points/7419 "2018-10-22T14:52:00Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Derek\_Arthur](https://community.pix4d.com/u/Derek_Arthur)
#### Post date: [October 22, 2018, 2:52pm UTC](https://community.pix4d.com/t/merging-projects-error-no-cameras-not-enough-3d-points/7419/1 "2018-10-22T14:52:00Z")
I was trying to merge two projects, they were subsets of the two flights of the same area, coordinate systems the same, height above the ellipse was entered and the same; The GCPs are common between projects for the most part; Flight 1 used we’ll say GCPs 1-7, Flight 2 used GCPs 3-6, both were georef and reoptimized; I had thought maybe it was due to using some of the GCPs in flight 1 as checks when they were being used as 3D in flight 2, but got the same error when I switch everything to 3D points. Any thoughts? At this time I’m presently just reprocessing the merged project and will re-optimize with the GCPs. Which leads to a follow up question, could a guy not initial process two flights, merge them, then georef, or do the two subsets always need to be georef prior to the merge.
here’s the message from the log;
[Processing]: Initialize automatic tie points.
[Processing]: Building automatic tie points.
[Error]: No calibrated cameras.
[Error]: InitialProcessing: cannot compute the mean resolution. Not enough calibrated 3D points.
[Processing]: Substep Report generation started.
[Processing]: Read keypoints.
[Warning]: Failed to read uncertainty data from C:/Users/RS i7/Documents/pix4d/180311\_DitchLake/18311\_DitchLake/1\_initial/project\_data/result\_uncertainties\_absolute\_full\_1.p4b
[Warning]: Failed to read uncertainty data from C:/Users/RS i7/Documents/pix4d/180311\_DitchLake/18311\_DitchLake/1\_initial/project\_data/result\_uncertainties\_relative\_full\_1.p4b
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### Author:  [@Daniel\_Rico\_Cordero](https://community.pix4d.com/u/Daniel_Rico_Cordero)
#### Post date: [October 25, 2018, 1:13pm UTC](https://community.pix4d.com/t/merging-projects-error-no-cameras-not-enough-3d-points/7419/2 "2018-10-25T13:13:22Z")
Hello Derek,
It would be useful to get the following information:
- Which version of the software are you using? There were some issues with older versions when merging projects
- The complete log file
- Quality Report of the two projects you want to merge
- Description of the computer that you are using
Thank you very much.