Stop cron daemon "symmetrical.xm" error messages in Terminal mail After upgrading to High Sierra (I think) I've started receiving the following message almost every time I start up Terminal:

You have new mail in /var/mail/MyUsername


I had some problems upgrading to High Sierra so I strongly suspect this started after the upgrade, but cannot be absolutely certain.

When I enter the $ mail command and read the messages (which can amount to hundreds at one go) this is what is written:

Message 1:
From MyUsername@Users-MacBook-Pro.local  Tue Nov 28 21:37:04 2017
X-Original-To: MyUsername
Delivered-To: MyUsername@Users-MacBook-Pro.local
From: MyUsername@Users-MacBook-Pro.local (Cron Daemon)
To: MyUsername@Users-MacBook-Pro.local
Subject: Cron &lt;MyUsername@Users-MacBook-Pro&gt; /Users/MyUsername/Library/symmetrical.xm/symmetrical.xm cr
X-Cron-Env: &lt;SHELL=/bin/sh&gt;
X-Cron-Env: &lt;PATH=/usr/bin:/bin&gt;
X-Cron-Env: &lt;LOGNAME=MyUsername&gt;
X-Cron-Env: &lt;USER=MyUsername&gt;
X-Cron-Env: &lt;HOME=/Users/MyUsername&gt;
Date: Tue, 28 Nov 2017 21:37:01 +0800 (+08)

/bin/sh: /Users/MyUsername/Library/symmetrical.xm/symmetrical.xm: No such file or directory


Also, when I run $ crontab -e, this is what is returned:

37 * * * * /Users/MyUsername/Library/symmetrical.xm/symmetrical.xm cr
~                                                                                                                              
~                                                                                                                             
"/tmp/crontab.SsevmMDt1o" 1L, 72C


I am trying to figure out why the Cron Daemon is sending me these error messages. To clarify, I would not like to suppress mail from cron altogether; so, I don't want to


Delete the MyUsername file at /var/mail/, OR
Change the MAILTO variable in /etc/crontab to MAILTO="" (as suggested in this link)


Instead, I'd be really grateful it if someone could help me understand 


How/why this started happening
What I can do to stop it from happening again (or if I should stop it from happening at all)
Which app/script requires the missing file/directory called symmetrical.xm and why


Any other additional information to add to the points listed above would also be greatly appreciated.

Thank you!



macOS High Sierra v10.13.1 (17B48)
open Terminal
run ls -l /Users/MyUsername/Library/symmetrical.xm/symmetrical.xm
If you get an error of any kind (directory or file not found) run crontab -r to remove your crontab.