In this article we will understand the meaning of error given by system when "show" command was executed.

root@Router1> show chassis alarms
error: Aborted! This command can only be used on the master routing engine.

This is a notification that certain commands can only be executed on the master routing engine; it is not an error. 

This command was executed on the backup routing engine; only the master routing engine will display output for a specific chassis or system-related show command.

Examples:
root@Router1> show chassis alarms 
error: Aborted! This command can only be used on the master routing engine.

root@Router1> show system alarms 
error: Aborted! This command can only be used on the master routing engine.

root@Router1> show chassis fpc  
error Aborted! This command can only be used on the master routing engine.

root@Router1> show chassis location 
error Aborted! This command can only be used on the master routing engine.

root@Router1> show chassis hardware 
error Aborted! This command can only be used on the master routing engine.

root@Router1> show chassis craft-interface 
error Aborted! This command can only be used on the master routing engine.

root@Router1> show system firmware 
error Aborted! This command can only be used on the master routing engine.

root@Router1> show chassis firmware 
error Aborted! This command can only be used on the master routing engine.

Use "show chassis routing-engine" to identify the master routing-engine.

Login from backup routing-engine to master routing-engine using "request routing-engine login other-routing-engine" and run the show commands which shows similar error notification.