我正在尝试为熊猫数据框创建列名。但是当我这样做时，会出现以下索引错误：
only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices
我以前没有收到此错误，所以我不知道为什么现在得到它，但是我的列名是字符串，所以不像我可以将字符串转换为整数。
a = spio.loadmat("Sub1.mat")
b = a['x']
person1 = pd.DataFrame(b[0])
person1.columns = ["Dream + Recall(NREM)","Dream + Recall(NREM)", "No Experience(NREM)", "No Experience(NREM)", "No Experience(NREM)", "Dream + Recall(NREM)", "Dream + Recall(REM)","Dream + Recall(NREM)", "Dream + Recall(NREM)", "Dream + Recall(REM)"]
您能帮我解决此错误吗？