The specified device class name is not defined with the DUMPLOADDB DEVCLASS option, to the server in the server options file or the server is not able to define the specified device class.
Processing continues. The dump/load process assumes the device class is devtype=FILE and writes to or reads from a file.
Refer to the other displayed messages to determine why the device class is not defined. Correct the problem and restart the command if you do not wish to write to or read from a file.