The account in KEEPER_PRIVATE_KEY does not have a USDC account
The account in KEEPER_PRIVATE_KEY has not been initialised on the ClearingHouse program yet. See for how to initialise the ClearingHouseUser
Since running a Keeper is a profit seeking endeavour, it is not unusual to run into competition while filling orders and liquidating dangerous positions. These errors can happen at various commitment levels, and how you handle them will be dependent on your skillset and craftiness. If you're looking for friends, come to #dev-chat and leak some alpha 🤓.