Tools import/export performance tests failed on build 7.1.0-1250

All tools import/export tests failed on build 7.1.0-1250. The tests failed when it ran cbexport.

http://perf.jenkins.couchbase.com/job/leto/20710/

root@172-23-100-213:/workspace/workspace/leto# ./opt/couchbase/bin/cbexport json --format list --output /data/workspace/backup/data.json --cluster http://leto-srv-01.perf.couchbase.com --bucket bucket-1 --username Administrator --password password --collection-field collection --scope-field scope --threads 16 --include-key key

JSON export failed: invalid sequence number 4 for vBucket 15 snapshot is {Start:0 End:0}

Logs:

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-20710/leto-srv-01.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-20710/leto-srv-02.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-20710/leto-srv-03.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-leto-20710/leto-srv-04.perf.couchbase.com.zip