help for pg_wal issue

Hi,

I want to backup my postgresql database but it fails because it is looking for some wal files on pg_wal directory.

Before backup I checked my pg_wal directory and I saw the wal file,

bash-4.2$ cd /pgdata/pgsql/data/pg_wal
bash-4.2$ ls
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000AE
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000AF
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B0
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B1
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B2
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B3
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B4
-rw------- 1 postgres postgres 16777216 Jun 24 01:16 000000010000000A000000B5
-rw------- 1 postgres postgres 16777216 Jun 24 01:31 000000010000000A000000B6
-rw------- 1 postgres postgres 16777216 Jun 24 01:46 000000010000000A000000B7

But backup fails with,

Failed to open: /pgdata//pgsql/data/pg_wal/000000010000000A000000AE
Error! The backup has failed.

After I checked pg_wal directory and really there is no such file, it was not appear on disk. What can I do for this? Please help..

bash-4.2$ cd /pgdata/pgsql/data/pg_wal
bash-4.2$ ls
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000AF
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B0
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B1
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B2
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B3
-rw------- 1 postgres postgres 16777216 Jun 24 01:01 000000010000000A000000B4
-rw------- 1 postgres postgres 16777216 Jun 24 01:16 000000010000000A000000B5
-rw------- 1 postgres postgres 16777216 Jun 24 01:31 000000010000000A000000B6
-rw------- 1 postgres postgres 16777216 Jun 24 01:46 000000010000000A000000B7
-rw------- 1 postgres postgres 16777216 Jun 24 02:01 000000010000000A000000B8

Regards,

Some of my parameters on postgresql.conf file;

wal_buffers = 16MB
max_wal_size = 5GB
min_wal_size = 2GB
shared_buffers = 4GB
max_wal_senders = 10
wal_level = replica
wal_keep_segments = 50

archive_mode = on # enables archiving; off, on, or always
archive_command = 'cp %p /pgdata/arc' # command to use to archive a logfile segment
archive_timeout =0 # force a logfile segment switch after this

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