Couchbase server bucket backup failed with python error

Couchbase server: 5.1.0-5552
OS Name: CentOS
Backup script: ./cbbackupwrapper http://servername.enterprisenet.org:44210 /backup/testBucket -u Administrator -p password -b testBucket

Error:
Traceback (most recent call last):
File “/opt/couchbase/lib/python/cbbackupwrapper”, line 4, in
import pump_transfer
File “/opt/couchbase/lib/python/pump_transfer.py”, line 13, in
import pump
File “/opt/couchbase/lib/python/pump.py”, line 26, in
import cbsnappy as snappy
File “/opt/couchbase/lib/python/cbsnappy.py”, line 9, in
exec stmt
File “”, line 1, in
File “/opt/couchbase/lib/python/pysnappy2/snappy.py”, line 50, in
from snappy_cffi import UncompressError, compress, decompress,
File “/opt/couchbase/lib/python/pysnappy2/snappy_cffi.py”, line 169, in
‘’', libraries=[“snappy”])
File “/usr/lib64/python2.7/site-packages/cffi/api.py”, line 450, in verify
lib = self.verifier.load_library()
File “/usr/lib64/python2.7/site-packages/cffi/verifier.py”, line 112, in load_library
self._write_source()
File “/usr/lib64/python2.7/site-packages/cffi/verifier.py”, 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