Error when entering recent visits in Reference Application

On entering the recent visits section on PostgreSQL , you get an error in the logs: https://pastebin.com/D9ZYPiXA . The problem is related to PostgreSQL and the sql being generated from this hql 

On debugging the sql being executed you get:

{{DEBUG - SqlStatementLogger.logStatement(128) |2020-07-31T19:40:39,661| }}
{{ select}}
{{ obs1_.obs_id as obs_id1_93_,}}
{{ obs1_.uuid as uuid2_93_,}}
{{ obs1_.person_id as person_i3_93_,}}
{{ obs1_.obs_datetime as obs_date4_93_,}}
{{ obs1_.value_group_id as value_gr5_93_,}}
{{ obs1_.value_datetime as value_da6_93_,}}
{{ obs1_.value_numeric as value_nu7_93_,}}
{{ obs1_.value_modifier as value_mo8_93_,}}
{{ obs1_.value_text as value_te9_93_,}}
{{ obs1_.value_complex as value_c10_93_,}}
{{ obs1_.comments as comment11_93_,}}
{{ obs1_.accession_number as accessi12_93_,}}
{{ obs1_.date_created as date_cr13_93_,}}
{{ obs1_.voided as voided14_93_,}}
{{ obs1_.date_voided as date_vo15_93_,}}
{{ obs1_.void_reason as void_re16_93_,}}
{{ obs1_.form_namespace_and_path as form_na17_93_,}}
{{ obs1_.status as status18_93_,}}
{{ obs1_.interpretation as interpr19_93_,}}
{{ obs1_.concept_id as concept20_93_,}}
{{ obs1_.value_coded as value_c21_93_,}}
{{ obs1_.value_coded_name_id as value_c22_93_,}}
{{ obs1_.value_drug as value_d23_93_,}}
{{ obs1_.order_id as order_i24_93_,}}
{{ obs1_.location_id as locatio25_93_,}}
{{ obs1_.encounter_id as encount26_93_,}}
{{ obs1_.creator as creator30_93_,}}
{{ obs1_.voided_by as voided_27_93_,}}
{{ obs1_.obs_group_id as obs_gro28_93_,}}
{{ obs1_.previous_version as previou29_93_ }}
{{ from}}
{{ obs obs0_ }}
{{ inner join}}
{{ obs obs1_ }}
{{ on obs0_.obs_group_id=obs1_.obs_id cross }}
{{ join}}
{{ encounter encounter2_ }}
{{ where}}
{{ obs0_.encounter_id=encounter2_.encounter_id }}
{{ and obs0_.voided='false' }}
{{ and encounter2_.visit_id=? }}
{{ and obs0_.concept_id=? }}
{{ and obs0_.value_coded=? }}
{{ group by}}
{{ obs0_.encounter_id ,}}
{{ obs0_.obs_group_id }}
{{ order by}}
{{ encounter2_.encounter_datetime desc,}}
{{ obs1_.obs_datetime desc}}
ERROR - SqlExceptionHelper.logExceptions(142) |2020-07-31T19:40:39,713| ERROR: column "obs1_.obs_id" must appear in the GROUP BY clause or be used in an aggregate function

Resolve this issue.