Keras network learner execution problem

I have Brain tumor MRI images dataset which contains 4 categories and I want to implement CNN to train model so that it learns to categorise unseen image( test data ) correctly. when I want to train my models with the nodes showed in the pictures I attach I get this error when executing keras network learner node based on the configuration also shown in the screenshots and I can not figure it out. would anyone kindly help me through solving that? Iget this error : Execute failed: Node training data size for input/target ‘dense20:0’ exceeds the expected size. Neuron count of this input/target is 1, batch size is 5712. Thus, expected training data size is 5712. Please check the column selection for this input/target and validate the node’s training data

and this is my workflow and node configuration: