src/client/pps.go
func (l *LogsIter) Err() error {
	if l.err == io.EOF {
		return nil
	}
	return grpcutil.ScrubGRPC(l.err)
}
func (l *LogsIter) Err() error {
	if l.err == io.EOF {
		return nil
	}
	return grpcutil.ScrubGRPC(l.err)
}
// Err retrieves any errors encountered in the course of calling 'Next()'.