What does "current node is not a delegate" mean?

It is not an error.

It means your node is not active delegate who is involved in block production.

If you already finished name registering (voting name is active), you are just not in this round of 24 nodes block producing committee. You will be in future rounds when it is your turn.

If you haven't finished name registering, please do it here: (during rehearsal period)

https://member-rehearsal.iotex.io/delegate/name-registration

And also set up your operator and reward IoTeX wallet.