"Encountered more 0 entries in index columns list than there were expressions in 'indexprs' expressions list for index 'activity_emd5_00_expr_activity_type_expr1_idx'. Current count = '1', parsed expressions = 1, 'indexprs' value='({OPEXPR :opno 3963 :opfuncid 3948 :opresulttype 25 :opretset false :opcollid 100 :inputcollid 100 :args ({VAR :varno 1 :varattno 6 :vartype 114 :vartypmod -1 :varcollid 0 :varlevelsup 0 :varnoold 1 :varoattno 6 :location 43} {CONST :consttype 25 :consttypmod -1 :constcollid 100 :constlen -1 :constbyval false :constisnull false :location 60 :constvalue 12 [ 48 0 0 0 118 101 114 116 105 99 97 108 ]}) :location 57} {OPEXPR :opno 3963 :opfuncid 3948 :opresulttype 25 :opretset false :opcollid 100 :inputcollid 100 :args ({VAR :varno 1 :varattno 5 :vartype 114 :vartypmod -1 :varcollid 0 :varlevelsup 0 :varnoold 1 :varoattno 5 :location 89} {CONST :consttype 25 :consttypmod -1 :constcollid 100 :constlen -1 :constbyval false :constisnull false :location 108 :constvalue 6 [ 24 0 0 0 105 100 ]}) :location 105})'"
For your reference, here's that index:
"activity_emd5_00_expr_activity_type_expr1_idx" UNIQUE, btree ((source_details ->> 'vertical'::text), activity_type, (activity_details ->> 'id'::text))
It has a lot of user friendly features particularly for data viewing and navigation, such as clicking through foreign key references to referenced rows, and the other way, looking up rows that reference this one, plus a lot of other stuff that I missed from other admin packages.
There's a demo here: http://teampostgresql.herokuapp.com/
Happy to answer any questions.