Aspen simulation error

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Errors in simulating the absorption of sulfur dioxide by ammonia water. The pair parameters for the ELECNRTL option set have been retrieved from the DATABANK ENRTL-RK. Information on the pure component parameters for some components is obtained from the DATABANK ELECPURE. These parameters are used with the ELECNRTL method, unless you enter your own parameters in the PROP-DATA sections. The VLBROC parameter was retrieved for the CO2 component; the THRSWT(ELEMENT/3) parameter was retrieved for the H2O component; the VLBROC parameter was also retrieved for the NH3 component; and the PLXANT parameter was retrieved for the H2O component. The structure for the O2S component has not been defined. PCES cannot use group-contribution methods to estimate missing properties; use the STRUCTURES section to define the structures of these components. The structure for the CO2 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the N2 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the H2O component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the O2 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the NH4OH component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the AMMON-01 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the AMMON-02 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the NH3 component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. The structure for the AIR component has not been defined; PCES cannot use group-contribution methods to estimate missing properties – use the STRUCTURES section to define its structure. * WARNING: In the physical property system, the asymmetric electrolyte NRTL model GMENRTLQ lacks certain parameters: The dielectric constant (CPDIEC) is missing for NH4OH and other components; the value for water’s CPDIEC will be assumed. Flowsheet analysis: The block $OLVER01 (Method: WEGSTEIN) has been defined to handle the convergence of streams: HOUT1. The computation order for the flowsheet is COMPR1 $OLVER01 ABSORBER HEATX (RETURN $OLVER01)