Error LinearRegression.fit(x,y) : Expected 2D array, got 1D array instead

Question

for mm in range(4):

x = t_teo[mm].reshape((-1,1))
y = t_exp[mm]
regression = LinearRegression()
model = regression.fit(x, y)
r_sq = model.score(t_teo[mm], t_exp[m