Keysight 33210A Guide D'utilisation page 299

Error Messages 5
-168
Block data not allowed
Data was sent to the function generator in arbitrary block format but this
command does not accept this format. Check to see if you have sent the correct
data type with the command. Example: BURS:NCYC #10
-170 to -178
Expression errors
The function generator does not accept mathematical expressions.
Keysight 33210A User's Guide 299