Greetings! I have been working on a foot pedal that will act like a stomp box mp3 player on stage at our church. I built my first prototype several months back and ironed out all the kinks. Since then, I have been asked to make more by friends and have been having issues with the new ones I am making. The DFPlayer mini will initialize, but will display the "wrong stack" error as soon as I try to play any files. It will then "Time Out". I have not been able to find anything online to help understand what this error means and what I need to do in order to fix it. I am using an Arduino Nano, DFPlayer mini, and the DFRobotDFPlayerMini library.