There are two identical packages for graphql.
?- pack_search(graphql).
% Contacting server at https://www.swi-prolog.org/pack/query ... ok
p graphql@0.0.1 - GraphQL Prolog Library
p graphql-swipl@0.0.1 - GraphQL Prolog Library
true.
I don’t know the reason for having two but one of them should be removed. My suggestion is to remove graphql-swipl as the use of - in the name requires the use of single quotes to avoid an error, e.g.
?- pack_install(graphql-swipl).
ERROR: Type error: `atom' expected, found `graphql-swipl' (a compound)
ERROR: In:
ERROR: [15] throw(error(type_error(atom,...),_40026))
ERROR: [11] prolog_pack:pack_default_options(graphql-swipl,_40064,[],_40068) at c:/program files/swipl/library/prolog_pack.pl:485
ERROR: [10] prolog_pack:pack_install(graphql-swipl) at c:/program files/swipl/library/prolog_pack.pl:457
ERROR: [9] <user>
ERROR:
ERROR: Note: some frames are missing due to last-call optimization.
ERROR: Re-run your program in debug mode (:- debug.) to get more detail.
Exception: (11) prolog_pack:pack_default_options(graphql-swipl, _40326, [], _40330) ? abort