ValueError: The following variable cannot be assigned with wide-form data: `hue`

hue 옵션을 이용해 병합된 데이터를 histplot의 값으로 생성할 때 발생

# input
sns.histplot(tt,hue='d',kde=True)
# output
ValueError: The following variable cannot be assigned with wide-form data: `hue`

x 값을 입력해주면 됨

sns.histplot(tt,x= 'mean', hue='d', kde=True)

참고