Hi @janniewu if you were a Norwegian client I would here have asked for a small subset of the imagery (for example the approx 50 images to the east in your screenshot) jut to verify if it id possible to process the imagery.
The 2 errors with respect to mosaic dataset.. may indicate problems with the geoprocessing environment/python. Have you tried to do a repair on the Drone2Map installation? If not that would be my first step