Issue with table creation script with online patching standard

I am trying to create a table in Oracle R12.2.3 with Online patching standard. Issue is with the script. I have written a single script for create table for custom schema and then execute AD_ZD_TABLE.UPGRADE('CUSTOM_SCHEMA' , 'TABLE_NAME);

Now while running from UNIX Server table and synonyms are getting created but I am getting following error

Table created.

PL/SQL procedure successfully completed.

CREATE TABLE CUSTOM_TOP.TABLE_NAME

  *

ERROR at line 1:

ORA-00955: name is already used by an existing object

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

This is impacting my upcoming migrations.