Unable to merge projects

A error, coed w0008, was showed when I tried merge two multispectral projects. Detailed description display that [pix4d_cameras_merge.cpp:81]Camera ID 18446744073709551615 not found project.
It is seem to a problem with camera, but I can not solve it

Hi @bigliyang123,

Can you attach the log file of the merged project and the two quality reports of the two individual multispectral projects? What were the steps you followed for merging?
You can find the steps for merging multispectral projects here: https://support.pix4d.com/hc/en-us/articles/360038663932-Merging-multispectral-projects-in-Pix4Dmapper.

Best,
Nikoleta