Caliper leveldb query error


My name is George and Im a student from Greece. During the benchmark on caliper i get these errors:
- Proposal response error by GET_QUERY_RESULT failed: transaction ID: c3f8001687ffb79f411a29510a573ff77da6237645d808ed2e395490880ba1ee: ExecuteQuery not supported for leveldb

Is there any way to fix this for leveldb or do I have to switch to couchdb?The version that im running is v1.4

Thanks in advance

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