Error: The 'Level' value (4) must be 'Field', 'Complex', 'Platform', 'Mobile' or 1, 2, 3.

Error: The 'Level' value (4) must be 'Field', 'Complex', 'Platform', 'Mobile' or 1, 2, 3.
 
Solution:
 
Ensure the data in the ‘Subject Level’ column on your Import spreadsheet reads 1,2 or 3 which represent Platform, Complex and Field respectively.