TypeError：找不到与ufunc lstsq_n匹配的匹配指定签名和强制转换的循环

Question

m , b = np.linalg.lstsq(X,Y)[0]
plt.plot(boston_df.RM,boston_df.Price,'o')

x = boston_df.RM
plt.plot(x, m*x +b,'r',label='Best Fit Line')