(process:1811): Indicator-Datetime-WARNING **: Unable to start "gnome-control-center datetime": Failed to execute child process "gnome-control-center" (No such file or directory)

(process:1811): Indicator-Datetime-WARNING **: Unable to start "gnome-control-center datetime": Failed to execute child process "gnome-control-center" (No such file or directory)

(process:1811): Indicator-Datetime-WARNING **: Unable to start "evolution "calendar:///?startdate=20150920T230000Z"": Failed to execute child process "evolution" (No such file or directory)