Oracle 12c DG Main Library Ora-00245:control file backup fail

Environment is 12.2.0.1 version, Oracle Data guard Main Library patrol found alert with abnormal error:

2018-07-10t13:24:04.710366+08:00
Errors in FILE/U01/APP/ORACLE/DIAG/RDBMS/DWDB/DWDB1/TRACE/DWDB1_M000_4455.TRC:
Ora-00245:control file backup failed; In Oracle RAC, Target might not is on shared storage
Removing incomplete backup control FILE/U01/APP/ORACLE/PRODUCT/12.2.0/DB_1/DBS/SNAPCF_DWDB1.F
Got error:245

**** WARNING ** *

The errors during Server autobackup is not fatal, as it

is attempted after sucessful completion of the command.

However, it's recomended to take an RMAN control file

Backup as soon as possible because the Autobackup failed

With the following error:

Ora-00245:control file backup failed; In Oracle RAC, Target might not is on shared storage

Memory This is a 11g bug, with ASM, the snapshot of the control file to be placed in the shared path, the environment 12C, there are such problems?

Rman> Show snapshot controlfile name;

RMAN configuration parameters for database with Db_unique_name dwdb is:
CONFIGURE SNAPSHOT controlfile NAME to '/u01/app/oracle/product/12.2.0/db_1/dbs/snapcf_dwdb1.f '; # Default

rman> CONFIGURE SNAPSHOT controlfile NAME to ' +data/dwdb/snapcf_dwdb1.f ';

New RMAN configuration parameters:
CONFIGURE SNAPSHOT controlfile NAME to ' +data/dwdb/snapcf_dwdb1.f ';
New RMAN configuration parameters is successfully stored

Rman> Show snapshot controlfile name;

RMAN configuration parameters for database with Db_unique_name dwdb is:
CONFIGURE SNAPSHOT controlfile NAME to ' +data/dwdb/snapcf_dwdb1.f ';

Specifically, you can refer to MoS
Ora-245:in RAC Environment from 11.2 onwards Backup Or Snapshot Controlfile needs to BES in shared location (document ID 1472171 .1)

I would like to record that a good memory than a bad pen ~

Oracle 12c DG Main Library Ora-00245:control file backup fail