The reason that these errors are appearing for this school is that in the Courses listed for these students such as ALG1 there is a skill set that is tied to the course. When you select the skill, the subject is listed with the skill being blank. The skill is tied to the skill ID that is showing for the error on the dashboard.
In order to correct this, the school will need to go to the Courses Screen and then select their course the error is appearing for. Once they do this they can select the skill Set Button and then double click on the skill line that appears and delete this skill. They will also need to delete the subject as well to avoid further errors. This would need to be completed for each course the error is appearing on. Once those are cleaned up and the import runs again it would correct those errors.