Data guard switch back

Hi,

I did switch over from primary to standby, now i can't do switch back to original roles and i can see the below logs in new standby mrp trace file.

MRP process is automatically terminating with the error 1110.

Can some one please suggest me?

*** 2023-01-11T17:39:57.873208+05:30

krsv_proc_add: Request to add process to V$MANAGED_STANDBY [krsm.c:1173]

krsm_post_rec_state_int: Managed Recovery: Initialization posted

*** 2023-01-11T17:39:58.275329+05:30

DDE: Problem Key 'ORA 1110' was flood controlled (0x1) (no incident)

ORA-01110: data file 1: '/u01/app/oracle/oradata/stand/system01.dbf'

ORA-01157: cannot identify/lock data file 1 - see DBWR trace file

ORA-01110: data file 1: '/u01/app/oracle/oradata/stand/system01.dbf'

ksvp2penabled: ep->flg = 0, rpr->slv_flg = 0

ksvp2penabled: ep = 0x7f8f24859848, rpr = 0x6fb70550

krsv_proc_rem: Request to remove process from V$MANAGED_STANDBY [krd.c:21016]

----- Abridged Call Stack Trace -----

ksedsts()+426<-krdsod()+251<-kss_del_cb()+218<-kssdel()+216<-krp_free_coordinator()+182<-krd_mrp_err_handler()+1813<-krsm_detached_process_entry()+2119<-ksbrdp()+1123<-opirip()+541<-opidrv()+581<-sou2o()+165<-opimai_real()+173<-ssthrdmain()+417<-main()+256

<-__libc_start_main()+245

----- End of Abridged Call Stack Trace -----

Partial short call stack signature: 0x8bab239aa8764409

<error barrier> at 0x7fff3fd2d340 placed krsm.c@1291

ORA-01110: data file 1: '/u01/app/oracle/oradata/stand/system01.dbf'

ORA-01157: cannot identify/lock data file 1 - see DBWR trace file

ORA-01110: data file 1: '/u01/app/oracle/oradata/stand/system01.dbf'

*** 2023-01-11 17:39:58.298998 [krsh.c:6348]

Background Media Recovery process shutdown