Neee is not, something else is wrong
My guess is that this chord either is in a very high or very low octave?
zasfx defines the number of octaves it should include, so your octave is properly outside that scope
Its kind of simple to fix, but you do need to use the advanced UI
It is that UI
If you do not see that when you choose Show-GUI on LMMS-zasfx, then you need to chage the UI-view. That is in the MISC menu.
Then in the Advanced view (picture) make sure you have a span from 0..127, and retry
Let us know the outcome :)