Build problem

--λ ocaml setup.ml -build
Finished, 1 target (0 cached) in 00:00:00.
+ ocamlfind ocamlc -c -g -package tyxml.parser -package tyxml -package threads -package str -package sexplib.syntax -package sexplib -package ocamlgraph -package core -thread -I lib -o lib/cppGenerator.cmo lib/cppGenerator.ml
File "lib/cppGenerator.ml", line 21, characters 6-24899:
Error: Some type variables are unbound in this type:
         class cppGenerator :
           graph:SuperIndex.G.t ->
           includes:string List.t ->
           bin_prefix:string ->
           string ->
           SuperIndex.index_t ->
           object
             method declare_locals :
               Core.Std.String.t List.t -> Core.Std.Out_channel.t -> unit
             method declare_params :
               Core.Std.Out_channel.t -> Core.Std.String.t List.t -> unit
             method gen_class :
               prefix:Core.Std.String.t List.t ->
               dir:string -> Parser.clas -> comp_target option
             method gen_enum_in_ns :
               key:'a SuperIndex.SuperIndex.key_ ->
               dir:string -> Parser.enum -> Core.Std.String.t option
             method gen_stub :
               prefix:Core.Std.String.t List.t ->
               isQObject:bool ->
               Core.Std.String.t ->
               [ `Private | `Protected | `Public ] ->
               Parser.func_arg Core.Std.List.t ->
               ?res_n_name:Parser.cpptype * Core.Std.String.t ->
               Core.Std.Out_channel.t -> unit
             method gen_stub_arguments :
               ?locals:Core.Std.String.t List.t ->
               Parser.constr -> Core.Std.Out_channel.t -> string List.t
             method gen_twin_header :
               prefix:Core.Std.String.t List.t ->
               Parser.clas -> Core.Std.Out_channel.t -> unit
             method gen_twin_source :
               prefix:Core.Std.String.t List.t ->
               Parser.clas -> Core.Std.Out_channel.t -> unit
             method generate_q :
               SuperIndex.NameKey.t Core.Std.Queue.t -> unit
             method get_name :
               classname:Core.Std.String.t ->
               [ `Private | `Protected | `Public ] ->
               Parser.func_arg Core.Std.List.t ->
               ?res_n_name:<hidden> -> bool -> Core.Std.String.t
             method is_abstr_class : Parser.clas -> bool
             method makefile :
               string ->
               twins:string List.t -> Core.Std.String.t List.t -> unit
             method private prefix : string
             method twin_methname :
               string -> [ `Private | `Protected | `Public ] -> string
           end
       The method gen_enum_in_ns has type
         key:'a SuperIndex.SuperIndex.key_ ->
         dir:string -> Parser.enum -> Core.Std.String.t option
       where 'a is unbound
Command exited with code 2.
Compilation unsuccessful after building 12 targets (0 cached) in 00:00:04.
E: Failure("Command ''/home/danmey/.opam/4.00.1/bin/ocamlbuild' lib/lablqt.cma lib/lablqt.cmxa lib/lablqt.a lib/lablqt.cmxs generator/generator.native xmltool/xmltool.native mocml/mocml.native -tag debug' terminated with error code 10")