It tells you that the resources will be available at 05:55 so before that you can't train a nobleman as it costs resources to train one. It always takes 0:18:53 to train a noble but first you have to pay the mentionend resources 40.000 50.000 50.000 100 for it and then you start the training of the nobleman and the time will also increase.
It says your farm is full but a nobleman needs 100 population. It would be nice if you could read what requirements you need for training a nobleman and what information is shown under "Educate".