<File or Folder> is not a valid file or path, and will be ignored. Add other files?(Y/N)

This error has the following cause and solution:

• The command line ss add command can accept multiple files or folders as parameters.  In this case, one of the parameters does not exist.

  Type Y if you want to continue adding the other files listed in the ss add command.

  Type N if you want to abort the add process and stop adding any other files in the ss add command.