Two capacitors with capacitance values $$C_1 = 2000 \pm 10$$ pF and $$C_2 = 3000 \pm 15$$ pF are connected in series. The voltage applied across this combination is $$𝑉 = 5.00 \pm 0.02$$ V. The percentage error in the calculation of the energy stored in this combination of capacitors is _______.