Dmx-on:changed action I get an error 408

Hi guys, I have a problem with the onchanged function. I have 3 select, starting with the first one I select a value which then generates the values of the second select. When I load the server connection through the dmx-on:changed action I get an error 408. Can anyone explain why? Thank you.

The 2 items you have on your dmx-on:changed will trigger at the same time, so the second one, will likely not have the value you are expecting. When loading your server connect, reference the selectedValue.toNumber() just as you do for the localStorage set.