Followed Below Steps
Create a root user and then granted priviliges
exec dbms_goldengate_auth.grant_admin_privilege('C##GGADMIN',container=>'all')
GGSCI (unixserver1) > dblogin userid c##ggadmin, password ggadmin
Successfully logged into database CDB$ROOT.
GGSCI (unixserver1) > REGISTER EXTRACT EXTORA DATABASE CONTAINER (PDB1);
Starting the extract gave below error:
ORA-00447: fatal error in background process ORA-00604: error occurred
Windows 10
GOldenGate 19c
Oracle Database 12.2 PDB