Hey @arthy thanks for the ping, although I'm not really sure the answer to this without more information. Could you provide your translation log file? Have you tried reading in your portal feature service and see if this exists? It seems that you are populating the dataset with a user parameter and the layer name with an attribute, could you try inputting those values manually and see if that works first as well? Also is there a reason you are using a FeatureReader instead of a classic Reader?