ORA-01111: name for data file 7 is unknown - rename to correct file

I was create tablespace in primary database when standby_file_management was set to manual for that I found the following error in alert log file and standby synchronization was stop.

Solution : Rename the unknown file name.

Managed Standby Recovery starting Real Time Apply
MRP0: Background Media Recovery terminated with error 1111
Errors in file /u01/app/oracle/diag/rdbms/sblcbsdr/sblcbsdr/trace/sblcbsdr_pr00_12778.trc:
ORA-01111: name for data file 7 is unknown - rename to correct file
ORA-01110: data file 7: '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007'
ORA-01157: cannot identify/lock data file 7 - see DBWR trace file
ORA-01111: name for data file 7 is unknown - rename to correct file
ORA-01110: data file 7: '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007'
Managed Standby Recovery not using Real Time Apply
Recovery Slave PR00 previously exited with exception 1111
MRP0: Background Media Recovery process shutdown (sblcbsdr)
Completed: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT
Wed Aug 24 15:38:20 2016
alter database create datafile '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007' as '+DATA'
ORA-1275 signalled during: alter database create datafile '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007' as '+DATA'
...
Wed Aug 24 15:38:46 2016
ALTER SYSTEM SET standby_file_management='MANUAL' SCOPE=BOTH;
alter database create datafile '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007' as '+DATA'
Completed: alter database create datafile '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007' as '+DATA'

[oracle@sbdbdr01 ~]$ sqlplus "/as sysdba"

SQL*Plus: Release 11.2.0.4.0 Production on Wed Aug 24 15:36:51 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;

Database altered.

SQL> alter database create datafile '/u01/app/oracle/product/11.2.4/db_1/dbs/UNNAMED00007' as '+DATA';

Database altered.

SQL>
SQL> alter system set standby_file_management=auto  scope=both;

System altered.

SQL>