I thought the same thing, i changed from 8080 to 9090 and it gave me the same error. I ran the net stat command to find the port being in used and guess what… there was nothing that is using 8080 or 9090

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN     
tcp6       0      0 [::]:tproxy             [::]:*                  LISTEN     
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN     
udp        0      0 0.0.0.0:mdns            0.0.0.0:*                          
udp        0      0 0.0.0.0:49645           0.0.0.0:*                          
udp        0      0 0.0.0.0:bootpc          0.0.0.0:*                          
udp6       0      0 [::]:mdns               [::]:*                             
udp6       0      0 [::]:44605              [::]:*                             
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7          
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     7951     /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     7954     /var/run/avahi-daemon/socket
unix  2      [ ACC ]     STREAM     LISTENING     7957     /run/thd.socket
unix  2      [ ACC ]     STREAM     LISTENING     10463    @/tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     5161     /run/systemd/fsck.progress
unix  2      [ ACC ]     STREAM     LISTENING     10321    /run/user/1000/systemd/private
unix  2      [ ACC ]     STREAM     LISTENING     10326    /run/user/1000/gnupg/S.gpg-agent
unix  2      [ ACC ]     STREAM     LISTENING     10329    /run/user/1000/bus
unix  2      [ ACC ]     STREAM     LISTENING     4967     /run/systemd/private
unix  2      [ ACC ]     STREAM     LISTENING     10331    /run/user/1000/gnupg/S.gpg-agent.browser
unix  2      [ ACC ]     STREAM     LISTENING     10363    /run/user/1000/gnupg/S.gpg-agent.ssh
unix  2      [ ACC ]     STREAM     LISTENING     10365    /run/user/1000/gnupg/S.gpg-agent.extra
unix  2      [ ACC ]     STREAM     LISTENING     8845     /var/run/dhcpcd.sock
unix  2      [ ACC ]     STREAM     LISTENING     5005     /run/systemd/journal/stdout
unix  2      [ ACC ]     STREAM     LISTENING     8847     /var/run/dhcpcd.unpriv.sock
unix  2      [ ACC ]     SEQPACKET  LISTENING     5325     /run/udev/control
unix  2      [ ACC ]     STREAM     LISTENING     10464    /tmp/.X11-unix/X0

Hello everyone.

I’ve followed the instructions and did everything in the comments (all 12 pages) to make sure I am doing them right. I was able to see MM2 thru the browser but on my screen, it is showing white screen.

Loading config ...
Loading module helpers ...
No helper found for module: alert.
Initializing new module helper ...
Module helper loaded: updatenotification
No helper found for module: clock.
Initializing new module helper ...
Module helper loaded: calendar
No helper found for module: compliments.
No helper found for module: currentweather.
No helper found for module: weatherforecast.
Initializing new module helper ...
Module helper loaded: newsfeed
All module helpers loaded.
Starting server on port 8080 ... 
Server started ...
Connecting socket for: updatenotification
Connecting socket for: calendar
Starting node helper for: calendar
Connecting socket for: newsfeed
Starting module: newsfeed
Sockets connected & modules started ...

Ready to go! Please point your browser to: http://localhost:8080
Whoops! There was an uncaught exception...
{ [Error: listen EADDRINUSE :::8080]
  code: 'EADDRINUSE',
  errno: 'EADDRINUSE',
  syscall: 'listen',
  address: '::',
  port: 8080 }
MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues

mind helping me out with this?