The number of entries in Factor A are unequal, or the number of entries in Factor B are not equally divided for the groups in Factor A, or there are data values missing for the corresponding factors.
Using an example of Male and Female for Factor A and Before and After for Factor B:
Factor A contains 8 entries for Male and 8 entries for Female.
Factor B contains 8 entries for Before (4 for Male and 4 for Female) and 8 entries for After (4 for Male and 4 for Female).
The dependent column contains the 16 data values that correspond to these conditions.
If any one of these is unequal, missing, or masked, this error message is displayed.
If any empty or masked cells are found, the entire row is omitted.