如下报错该如何解决？

def modulate_2ask(binary_seq, carrier_freq=1000, sample_rate=10000): t = np.linspace(0, len(binary_seq), len(binary_seq)sample_rate, endpoint=False) baseband_signal = 2 np.array([int(b) for b in binary_seq]) - 1 modulated_signal = baseband_signal np.sin(2 np.pi carrier_freq t) return t, modulated_signal t_2ask, modulated_2ask = modulate_2ask(binary_sequence) 报错，该如何解决？