Alrighty! Assuming you’re on a windows computer, press the Windows key + R, a little menu should pop up, in that type %appdata%, then look for a folder called .minecraft, in this folder there’ll be another one called logs.
Click that then find your most recent log (they’re organised by date), and in the log, search for your IGN, or “Spawners” - basically anything that will bring up the message given in chat, and you can screenshot this, and attack it to your support ticket.