Nagios - External command error: Command failed

Question

I followed a tutorial for setting SNMP trap for Nagios Core 4.4.3.

After Service snmptrapd executes the script:

#!/bin/sh
echocmd="/bin/echo"    
CommandFile="/var/spool/nagios/cmd/nagios.cmd"    
datetime=`date +%s`    
cmdline="[$datetime] PROCESS_SERVICE_CHECK_RESULT;$1;$2;$3;$4"

 `$echocmd $cmdline >> $CommandFile`

It gives following error (found in /var/log/messages):

nagios: External command error: Command failed

How can this be fixed?

Answer 1

Edit : solved. Had to comment datetime and modify the next line of code the way Rohlik told me.

#!/bin/sh
echocmd="/bin/echo"
CommandFile="/var/spool/nagios/cmd/nagios.cmd"
####datetime=`date +%s`
cmdline="[$(date +%s)] PROCESS_SERVICE_CHECK_RESULT;$1;$2;$3;$4"
`$echocmd $cmdline >> $CommandFile`