Is there anyone who can help me figure out how to solve the problems with this ASPEN model for extraction?

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I’m new to chemical engineering; here are my questions -> Processing input specifications... The structure for component N235 has not been defined. PCES cannot use group-contribution methods to estimate the missing properties; use the “Structures” section to define the structures for this component. * WARNING in the “Stream” section, starting on line 78: The stream name is incorrect. The mole flows of the substreams labeled “MIXED” are normalized to the total mole flow value. * WARNING in the “Stream” section, starting on line 82: The stream name is incorrect. The mole flows of the water component in the substreams labeled “MIXED” are normalized to the total mole flow value. Flow sheet analysis: Block $OLVER01 (Method: WEGSTEIN) has been defined to handle the convergence of streams: 10 9 8 7. The calculation order for the flow sheet is: $OLVER01 B1 B2 B3 B4 B5 (RETURN $OLVER01). Calculations have begun... > Convergence loop for $OLVER01 begins. Method: WEGSTEIN. Streams being converged: 10 9 8 7. Block: B1, Model: DECANTER. * WARNING: No phase splitting occurs under the given specifications; a single-phase solution is returned. Block: B2, Model: DECANTER. * WARNING: No phase splitting occurs under the given specifications; a single-phase solution is returned. Block: B3, Model: DECANTER. * WARNING: No phase splitting occurs under the given specifications; a single-phase solution is returned. Block: B4, Model: DECANTER. * WARNING: No phase splitting occurs under the given specifications; a single-phase solution is returned. The activity coefficient model GMUFAC lacks certain parameters: the UNIFAC group structural information parameter, UFGRP (Dataset 1), is missing for component N235; no UFGRP parameters were provided by the user, and no defaults can be found in the database! Calculations were stopped due to missing property parameters