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Failed to merge project. How to solve?

Hi @edwardrc

Thanks for the screenshot.

I have seen users getting this error when trying to merge multispectral projects and you should follow the steps in Merging multispectral projects in Pix4Dmapper – Support.
Maybe a quick win: unselect Duplicate Camera Parameters then try again.

Else (or if it is not a multispectral project), please provide the quality reports of each sub-project so that we can have a look and some information about what you are trying to achieve, thanks!