Receiving an error message about bad file size on saving or loading waveform. Why?

Receiving an error message about bad file size on saving or loading waveform. Why?

The waveform file for the AWG must meet certain requirements on file lengths. There are three:

1. Minimum length of 960 samples.
2. Maximum length (this is governed by the maximum amount of memory in the unit, standard or optional memory purchased)
3. Step size; for the AWG710/710B/615 it is 4. The file length in samples must result in an integer number when divided by 4.