E-01 error on CD changer

For my 1998 VW new beetle

My car had this problem. It worked 80% of the time. I used the radio most of the time but when I started to listen to some CDs, I would get errors and the whole thing would just freeze. I started having overheating issues with my car so I had a mechanic fix the problem. While fixing the overheating problems, the mechanic also discovered there was an electrical error and he detached my stock radio/cd changer and said it was causing some of the problems. I purchased and installed a brand new CD/AUX/USB/RADIO deck myself and now my cruise control and rear defrost works perfectly. The mechanic said he wasn't surprised that the new electrical piece he replaced fixed those minor problems.