Running error in Aspen V7

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I am using intermittent reactive distillation, and what is the reason for the error that occurred during the calculations? How to solve it? Thank you to everyone for their help -> Processing input specifications... Flowsheet Analysis: COMPUTATION ORDER FOR THE FLOWSHET: B1 -> Calculations have begun... Block: B1 Model: BATCHSEP. Solver settings are being applied. Time at start of run: 19:01:20. Operating steps for block B1 are being updated. Tasks are being deleted. The total reflux script has been started. Current time: 19:01:21. Column B1 is being initialized at total reflux; initialization takes place at time 0. The initialization step at time 0 was successful. The simulation run is complete. InitMode is set to TotalReflux. Current time: 19:01:22. InitMode has been set to TotalReflux. Current time: 19:01:23. Homotopy parameters are as follows: InitHomStep................:0.1, MaxHomStep.................:1, MinHomStep.................:0.01, IncrHomStep................:10, DecrHomStep................:0.5. Initialization attempts at time 0 resulted in convergence failure; it is necessary to return to the best point and reduce the step size. Initialization attempts at time 0 also resulted in convergence failure; again, it is necessary to return to the best point and reduce the step size. Initialization attempts at time 0 still resulted in convergence failure; once more, it is necessary to return to the best point and reduce the step size. Initialization attempts at time 0 once again led to convergence failure. Homotopy failed: it is not possible to reduce the step size any further. The solution was returned to the best point at a parameter value of 0. The initialization attempt at time 0 failed. The problem failed to converge. HomFrac=0. Initialization using homotopy at total reflux also failed to converge. Possible reasons for this failure include: The specified initial charge might be smaller than the sum of the holdups specified for the various stages and drums. The specified or calculated pot duty might be too low. Non-condensibles might be present in the initial charge. Initialization failed. Time at end of run: 19:01:53. ** ERROR: Internal error. ** ERROR: Block B1 failed to converge after 0 iterations. -> Simulation calculations are complete... *** Summary of errors *** Physical Property System Simulation: Terminal errors: 0, 0, 0. Serious errors: 0, 0, 0. Errors: 0, 0, 2. Warnings: 0, 0, 0. The entire calculation process is shown here. Please let me know what’s going on This post was last edited by banmajuventus on 2009-3-24 19:08]