Error in epoch_mining.log

PoW Mining AE
1

./bin/epoch check_config epoch.yaml is OK.
I start it with ./epoch start.
There seem has something mistakes shows in epoch_mining.log.

image
image.png1471×939 118 KB

Here is the epoch.yaml :

---
sync:
    port: 3115
    external_port: 3015

keys:
    dir: keys
    password: "123456"

http:
    external:
        port: 3013
    internal:
        port: 3113

websocket:
    internal:
        port: 3114
    channel:
        port: 3014

mining:
    beneficiary: "ak_2LRE68L4vK5J3JDgfqMoPWNa2WiuShhzKGRraYPiydibuytA1o"
    autostart: true
    cuckoo:
        miner:
            executable: lean30
            extra_args: ""
            node_bits: 30
chain:
    persist: true
    db_path: ./my_db