RMAN Creating automatic instance fails I am trying to transport a tablespace in RMAN. The command I'm running is

transport tablespace usr_table auxiliary destination '/oracle/rman/auxFiles' tablespace destination '/oracle/rman';


The initialization parameters used for the automatic instance are

initialization parameters used for automatic instance:
db_name=ORCL
db_unique_name=tnpD_pitr_ORCL
compatible=12.2.0
db_block_size=8192
db_files=200
diagnostic_dest=/opt/oracle
_system_trig_enabled=FALSE
sga_target=2048M
processes=200
db_create_file_dest=/oracle/rman/auxFiles
log_archive_dest_1='location=/oracle/rman/auxFiles'
#No auxiliary parameter file used


The error I'm getting is 

RMAN-03002: failure of transport tablespace command at 06/10/2020 15:32:40
RMAN-04014: startup failed: ORA-27125: unable to create shared memory segment
Linux-x86_64 Error: 28: No space left on device
Additional information: 3822
Additional information: 2130706432


I need to change the 

diagnostic_dest=/opt/oracle


Should I make an auxiliary file and if so do I need to put all the parameters that are shown in the rman output?
My issue was that the auto_extend for one of my tablespaces had been set to off. Once I changed that I was able to run my commands