Database Error

[dmarzzz]

I ran

contender % cargo run setup ./scenarios/stress.toml http://experi-proxy-dcb3yn8uzjpc-196463883.us-east-2.elb.amazonaws.com  

and got

     Running `target/debug/contender setup ./scenarios/stress.toml 'http://***.com'`
No private keys provided. Using default private keys.
deploying contract: "SpamMe3"
thread 'tokio-runtime-worker' panicked at /Users/***/***/tools/contender/crates/core/src/test_scenario.rs:191:22:
failed to send tx: ErrorResp(ErrorPayload { code: -32000, message: "already known", data: None })
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Error: DatabaseError: join error; callback crashed task 16 panicked with message "failed to send tx: ErrorResp(ErrorPayload { code: -32000, message: \"already known\", data: None })"