ValueError: not enough values to unpack (expected 2, got 1)

在python中使用字符串分片时遇到这个问题

[ValueError: not enough values to unpack (expected 2, got 1)]

-------------->>[  值错误：没有足够的值剖解（期望2，获得1）]

【原码如下】

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f = open('E:\\PYTHON\\talking.txt',encoding = 'utf-8')

boy = []
girl = []
count = 1

for each_line in f:
    if each_line[:6] != '======':
        
        (people,line_talk) = each_line.split(':',1)
        if people == 'OLIVER':
            boy.append(line_talk)
        if people == '赵琳