[Desktop] [Pix4Dmapper 4.4.12] Problem with merged multispectral project on processing steps 2 and 3

Hello. I merged two multispectral projects into one (flights/image acquisitions for these two projects were done on different (but consecutive) days with eBee drone and Sequoia multispectral camera). Merger was done after processing step 1 and marking some MTPs with the same name in each. But further processing steps (2 and 3) were not successful. got the warning message:[Warning]: Unable to estimate direct sunlight fraction: The sun is behind the horizon. Any idea what could be the reason? unfortunately could not find the report in the project folder. 

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