6027-1613 WCOLL (working collective) environment variable not set.

Explanation
The mmdsh command was invoked
without explicitly specifying the nodes on which the command is to
run by means of the -F  or -L options,
and the WCOLL environment variable  has not been set.
User response
Change the invocation of the mmdsh command
to use the -F  or -L options,
or set the WCOLL environment variable before invoking the mmdsh command.