error(NOT_A_PHASE1_DIR + ": " + phaseIPath);
failUsage();
}
// Fail if the working path doesn't contain any proto-networks
final File[] networks = phaseIPath.listFiles(new ProtonetworkFilter());
if (networks.length == 0) {
error(NO_PROTO_NETWORKS + " found in " + phaseIPath);
failUsage();
}