Read the statement by Michael Teeuw here.
MM screen remains blank even after boot
I added the remote control module to my magic mirror. Instead of displaying the appropriate MM screen when prompted to, it began to display the message please create a config file. I deleted the module I had added in the config file and saved the file. When I restarted the mirror, it just produced a black terminal with the word “electron” on the terminal header. I’m using raspberry pi B+, running on the latest update