Message EZA1771I is displayed

The FTP client displays the EZA1771I subcommand fails: name is of an unsupported type message. This message is issued when the data set being transferred is not supported by the MVSGet or MVSPut subcommand. The supported data set types are z/OS® physical sequential data set, z/OS partitioned data set, z/OS libraries, and z/OS generation data sets. See the MVSGET subcommand or the MVSput subcommand in z/OS Communications Server: IP User's Guide and Commands for more information.