This error occurs when the School Phase is missing on your School Details table. Schools are advised to complete the relevant areas of the table as part of your 1st Time Setup when you join ScholarPack. All areas in red in the image below are mandatory for each School Census and will need to be completed.
Please go to Admin > Config > Core Set Up > School (or click on your school name at the top right of ScholarPack), it will take you to the School Details Table. Click on Edit and then select the appropriate Phase from the drop down for your school.
Click Update at the base of the page to save the information.
Note: The data will not save unless all the red fields hold a value, and a pop up will appear to indicate information needs to be input if some of those fields are still empty.