Cause: Required user name argument was not specified.

Cause: Required node list was not supplied.

Cause: Operation type missing or mis-spelled.

Cause: Required administrator password was not read in response to the password prompt before finding end-of-line.

Cause: Unexpected I/O exception was encountered while attempting to read the password. Exception string should indicate the precise cause.

Cause: The indicated operation could not be completed for the specified node. The lower-level error messages attached should indicate the root cause.