While starting up a parallel task, the message

  execClient: chdir(/usr/tmp/username/./.): No such file or \
    directory
  Will use user's home directory
  ---------------------------------------
    

is displayed.

The current directory /usr/tmp/username does not exist on one or more of the remote nodes. The user's home directory, defined by the environment variable HOME will be used instead.

Make sure that the directory /usr/tmp/username is accessible on each node or change your current directory to a globally accessible directory.