ORA-01110 ORA-01111: name for data file 69 is unknown - rename to correct file

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Today,  I has added a datafile of an tablespace with 'alter tablespace tbs_name add datafile '+DATA' 8g'.  I received a critical warning that the data guard standby machine done which could not synchronous the data after a period time.
I viewed the alert log and found that the DG machine's asm disk group has a little space which less then 8g, and can not synchronous the 'create datafile ...'.
So, I added the space of the asm disk group. When I startup the DG instance,  encountered the error
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MRP0: Background Media Recovery terminated with error 1111  
Errors in file /u01/app/oracle/diag/rdbms/db4dg/cedb/trace/cedb_pr00_25766.trc:  
ORA-01111: name for data file 69 is unknown - rename to correct file  
ORA-01110: data file 69: '/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00069'  
ORA-01157: cannot identify/lock data file 69 - see DBWR trace file  
ORA-01111: name for data file 69 is unknown - rename to correct file  
ORA-01110: data file 69: '/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00069'  
Managed Standby Recovery not using Real Time Apply  
Slave exiting with ORA-1111 exception  


In order to deal with the erro , I done as the following:
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alter system set standby_file_management=manual;  
alter database create datafile   
  '/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00069' as '+DATA/db4dg/datafile/tbs_name';  
  alter system set standby_file_management=auto;  
alter database recover managed standby database disconnect from session using current logfile;  (11g)  
alter database recover managed standby database disconnect from session;(10g)