matmul: Input operand 1 has a mismatch in its core dimension 0, with gufunc signature (n?,k),(k,m?)->(n?,m?) (size 5 is different from 1)

Question

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
%matplotlib inline

df = pd.read_excel(\'enes.xlsx\')
X=pd.DataFrame(df[\'hacim\'])
Y=pd.DataFrame