list index out of range when adding variables

This is my code for adding variables:

for k in range(0, data.vehicleNum - 1):
    for d in range(0, data.droneNum - 1):
        name1 = 'P_' + str(k) + '_' + str(d)
        P[k][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name1)
        for i in range(0, data.nodeNum - 1):
            name2 = 'C_' + str(i) + '_' + str(k)
            name3 = 'Ct_' + str(i) + '_' + str(d)
            name4 = 'Vl_' + str(i) + '_' + str(k) + '_' + str(d)
            name5 = 'Vr_' + str(i) + '_' + str(k) + '_' + str(d)
            name10 = 'A_' + str(i) + '_' + str(k)
            name11 = 'a_' + str(i) + '_' + str(k) + '_' + str(d)
            name12 = 'R_' + str(i) + '_' + str(k)
            name13 = 'r_' + str(i) + '_' + str(k) + '_' + str(d)
            name14 = 'S_' + str(i) + '_' + str(k)
            name15 = 's_' + str(i) + '_' + str(k) + '_' + str(d)
            name16 = 'Dk_' + str(i) + '_' + str(k) + '_' + str(d)
            name17 = 'temp_' + str(i) + '_' + str(k) + '_' + str(d)
            name18 = 'temp_1_' + str(i) + '_' + str(k) + '_' + str(d)
            name19 = 'temp_2_' + str(i) + '_' + str(k) + '_' + str(d)
            C[i][k] = model.addVar(0, 1, vtype=GRB.BINARY, name=name2)
            Ct[i][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name3)
            Vl[i][k][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name4)
            Vr[i][k][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name5)
            A[i][k] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name10)
            a[i][k][d] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name11)
            R[i][k] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name12)
            r[i][k][d] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name13)
            S[i][k] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name14)
            s[i][k][d] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name15)
            Dk[i][k][d] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name16)
            temp[i][k][d] = model.addVar(vtype=GRB.CONTINUOUS, name=name17)
            temp_1[i][k][d] = model.addVar(vtype=GRB.CONTINUOUS, name=name18)
            temp_2[i][k][d] = model.addVar(vtype=GRB.CONTINUOUS, name=name19)
            for j in range(0, data.nodeNum - 1):
                name6 = 'X_' + str(i) + '_' + str(j) + '_' + str(k)
                name7 = 'Y_' + str(i) + '_' + str(j) + '_' + str(k) + '_' + str(d)
                name8 = 'T_' + str(i) + '_' + str(j) + '_' + str(k)
                name9 = 't_' + str(i) + '_' + str(j) + '_' + str(k) + '_' + str(d)
                X[i][j][k] = model.addVar(0, 1, vtype=GRB.BINARY, name=name6)
                Y[i][j][k][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name7)
                T[i][j][k] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name8)
                t[i][j][k][d] = model.addVar(0, big_M, vtype=GRB.CONTINUOUS, name=name9)

Error as follows:

Traceback (most recent call last):
  File "E:/PycharmProjects/project/gurobi.py", line 275, in <module>
    Y[i][j][k][d] = model.addVar(0, 1, vtype=GRB.BINARY, name=name7)
IndexError: list index out of range