Quote from: Claymore on April 11, 2016, 09:50:15 PM

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.
"

Based on the console output, it just seems your miner doesn't understand the work JSON.