Try and add Monitoring to folder - get error "In Handler monitor cannor perform action "Post" without a target name to act on"

Hi guys, bit of a splunk newbie here, but muddling my way along with all the great articles on here. Im having an issue where I want to set up monitoring on a folder in C:\Program Files\Test\App\Master\Logs using the cmd line, command of splunk add monitor -C:\Program Files\Test\App\Master\Logs I get the error message: In Handler monitor cannor perform action "Post" without a target name to act on. I managed to add monitoring to another folder on the D: drive no problem just before this. Any help would be much appreciated. Thanks Steve