When RadFrac simulates the distillation of sulfuric acid and water, should ELECNRTL be used as the physical property method?

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When using ASPEN's RadFrac to simulate sulfuric acid and water distillation, should ELECNRTL be used as the physical property method? Should I use the True component approach or the Apparent component approach in the electrolyte guide? Recommend a theoretical plate number and reflux ratio. . Why do I keep reporting errors? * * * :Q SEVERE ERROR MATERIAL AND ENERGY BALANCES FAILED TO CONVERGE: CHECK COL-SPECS OR SUPPLY BETTER TEMPERATURE AND COMPOSITION ESTIMATES. * * * SEVERE ERROR THE FOLLOWING STAGES DRIED UP: 5 6 A LIMIT OF 0.10000E-04 * SUM OF FEEDS WAS IMPOSED ON THE FLOW RATES. * * ERROR BLOCK B1 IS NOT IN MASS BALANCE: MASS INLET FLOW = 0.47261278E-01, MASS OUTLET FLOW = 0.65281875E-01 RELATIVE DIFFERENCE = 0.38129727E+00 * WARNING STREAM 2 IS NOT IN CHARGE BALANCE: ANION FLOW = -.19619664E-03, CATION FLOW = 0.35810009E-04 RELATIVE DIFFERENCE = -.44788212E+01 * WARNING STREAM 3 IS NOT IN CHARGE BALANCE: ANION FLOW = -.88608389E-04, CATION FLOW = 0.40697898E-04 RELATIVE DIFFERENCE = -.11772227E+01