Keras Network Learner

I’m trying to run a neural network to identify minerals that are present in the analysis of construction materials, and I’m very new to the software. I have also created a rule engine to convert the string mineral name into integers so that it can be read. Can anyone help me with getting my neurons to work together? The error message I’m getting is ‘Selected target columns do not provide enough elements (1) to populate all neurons (16) of the network target ‘dense20:0’. Try adding some columns to the selection’. Any further advice on what I can do to get this network running would also be greatly appreciated.

Testing Processed Data - Datapeaks.knwf