Issue during datapatch verbose command in 12c patching (ORA-20001)

ORA-20001: Latest xml inventory is not loaded into table

After successfully applying the opatch apply command, when we execute the post-installation steps of Patch in 12c home. i.e data patch -verbose then we will get the following error:

Error:

Bootstrapping registry and package to current versions…done
verify_queryable_inventory returned ORA-20001: Latest xml inventory is not loaded into table

Queryable inventory could not determine the current opatch status.
Execute ‘select dbms_sqlpatch.verify_queryable_inventory from dual’
and/or check the invocation log
E:\oracle\cfgtoollogs\sqlpatch\sqlpatch_1080_2017_07_16_01_49_49\sqlpatch_invocation.log for the complete error.
Prereq check failed, exiting without installing any patches.

Please refer to MOS Note 1609718.1 and/or the invocation log
E:\oracle\cfgtoollogs\sqlpatch\sqlpatch_1080_2017_07_16_01_49_49\sqlpatch_invocation.log for information on how to resolve the above errors.

Solution:

On checking the database alert log file. We found the issue with TEMP Tablespace. So, we dropped the temp files of temp Tablespace and added a new temp file in TEMP Tablespace.

On Alert Log file:
Sat Sep 16 11:45:43 2017
Errors in file E:\ORACLE\diag\rdbms\orcl\ORCL\trace\ORCL_m002_2280.trc:
ORA-01187: cannot read from file because it failed verification tests
ORA-01110: data file 201: ‘E:\ORACLE\ORADATA\ORCL\TEMP01.DBF’

We first added a new temp file in the TEMP tablespace and dropped the existing temp file. For drop and add go to the following link:
Manage Temp Tablespace

Verify the space on other tablespace with the following query:
Note: If Space is less then increase the space or enable auto extend on

column "MAXSIZE (MB)"  format 9,999,990.00
column "USED (MB)" format 9,999,990.00
select  a.tablespace_name,a.bytes_alloc/(1024*1024) "MAXSIZE (MB)",
nvl(b.tot_used,0)/(1024*1024) "USED (MB)" from (select tablespace_name,
sum(bytes) physical_bytes,sum(decode(autoextensible,'NO',bytes,'YES',maxbytes)) bytes_alloc
from  dba_data_files group by tablespace_name ) a,(select tablespace_name,
sum(bytes) tot_used from dba_segments  group by tablespace_name ) b
where  a.tablespace_name = b.tablespace_name (+) and a.tablespace_name not in
(select distinct  tablespace_name  from dba_temp_files)