ReaR failed to use mounted AIX NFS FS

hi folks
i have issue in using the rear backup to backup OS to AIX mounted NFS
I tried to run rear -v mkbackup I had the below error

mkdir: cannot create directory ‘/MEG-sysbackup/rear_bkp/mag-bw-dev-Apr’: File exists
Relax-and-Recover 2.4 / Git
Running rear mkbackup (PID 12918)
Using log file: /var/log/rear/rear-mag-hana-dev.log
ERROR: Mount command ‘mount -v -t nfs -o nfsvers=3,nolock /tmp/rear.o6gfxSxuf1UYWER/outputfs’ failed.
Some latest log messages since the last called script
mount.nfs: trying prog 100003 vers 3 prot TCP port 2049
mount.nfs: trying prog 100005 vers 3 prot UDP port 50901
mount.nfs: mount(2): Permission denied
mount.nfs: access denied by server while mounting
mount.nfs: timeout set for Sun Apr 17 14:57:29 2022
mount.nfs: trying text-based options ‘nfsvers=3,nolock,addr=’
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: prog 100005, trying vers=3, prot=17
Aborting due to an error, check /var/log/rear/rear-mag-hana-dev.log for details
Exiting rear mkbackup (PID 12918) and its descendant processes
Running exit tasks