This error prevents you from sending tokens. The complete error log is:
The transaction contains more then one action, but it was signed with an access key which allows transaction to apply only one specific action. To apply more then one actions TX must be signed with a full access key
This known issue is present with 2FA accounts and is affecting all token transfers (not function calls such as staking and unstaking).
While a fix is being introduced, you can temporarily disable the 2FA functionality for the time needed to perform your transaction, and re-enable it once done.