Couchbase server bucket backup failed with python error

Couchbase server: 5.1.0-5552
OS Name: CentOS
Backup script: ./cbbackupwrapper /backup/testBucket -u Administrator -p password -b testBucket

Traceback (most recent call last):
File “/opt/couchbase/lib/python/cbbackupwrapper”, line 4, in
import pump_transfer
File “/opt/couchbase/lib/python/”, line 13, in
import pump
File “/opt/couchbase/lib/python/”, line 26, in
import cbsnappy as snappy
File “/opt/couchbase/lib/python/”, line 9, in
exec stmt
File “”, line 1, in
File “/opt/couchbase/lib/python/pysnappy2/”, line 50, in
from snappy_cffi import UncompressError, compress, decompress,
File “/opt/couchbase/lib/python/pysnappy2/”, line 169, in
‘’', libraries=[“snappy”])
File “/usr/lib64/python2.7/site-packages/cffi/”, line 450, in verify
lib = self.verifier.load_library()
File “/usr/lib64/python2.7/site-packages/cffi/”, line 112, in load_library
File “/usr/lib64/python2.7/site-packages/cffi/”, line 201, in _write_source
with open(self.sourcefilename, “w”) as fp:
IOError: [Errno 2] No such file or directory: ‘/opt/couchbase/lib/python/pysnappy2/pycache/_cffi__x762f05ffx6bf5342b.c’

Kindly help me to fix this.

Couchbase team, please help on this. Thanks