Compatible dimensions in reader and config

When you modify a working config file to change the dimensionality of the output (e.g. take a config that works for a 7 class problem and make a new one that should work for a 5 class problem) you may encounter the error message

NotifyFunctionValuesMBSizeModified: labels InputValue operation had its row dimension 7 changed by the reader to 5

This is most likely due to only updating the network definition part of your config file but not your reader definition.