@jmwyds Sam, I replaced the code in socketclient.js rather than socket.js after reading that post that you linked to more fully and now the error has stopped popping up! Thanks for your help! I just have to figure out how to get the remote-control pictures back on the buttons and I am good to go:)

For anyone trying to fix the missing icon problem on MMM-Remote-Control, check out this post https://forum.magicmirror.builders/topic/735/remote-control-shutdown-configure-and-update-your-magicmirror/260