I cannot find any Ethereum mining info on "f2pool.com". Perhaps it does not accepts wallet addresses but requires Login.Worker username format, such pools are not supported.
https://www.f2pool.com/help"
eth.f2pool.com:8008
How to mine Ethereum at F2Pool?
Please configure your eth-proxy set either WALLET to your payout address or MONITORING_EMAIL to your F2Pool user name or login email. If you leave MONITORING_EMAIL empty, the workers page is available at
https://www.f2pool.com/eth/. Otherwise you can also check your account info on your logged-in dashboard.
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Based on the console output, it just seems your miner doesn't understand the work JSON.