Where is the VLC log?

The VLC media player sometimes errors out with the message "Check the log for details":

But where is the log?

What you need to do:

• Type <Ctrl>-M or click Top Menu => Tools => Messages

• Increase the verbosity to "1 (warnings)":
  
  (You could increase the verbosity even more, but that might create so much output that you cannot find the actual error anymore.)

• Leave the messages window open and recreate the problematic behaviour