ArgumentError: Distributed.var doesn't have a defined StructTypes.StructType

[etjekant]

Hey, I am running a function (That returns an interger) using the @sync @distributed macros in Julia. The function runs completely but upon returning I get the following error:

Error: error handling request │ exception = │ ArgumentError: Distributed.var"#165#167"{var"#1344#1348"{Vector{Vector{String}}}, Base.OneTo{Int64}} doesn't have a definedStructTypes.StructType │ Stacktrace: │ [1] write(::StructTypes.NoStructType, buf::Vector{UInt8}, pos::Int64, len::Int64, ::Distributed.var"#165#167"{var"#1344#1348"{Vector{Vector{String}}}, Base.OneTo{Int64}}; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:92 │ [2] write(::StructTypes.NoStructType, buf::Vector{UInt8}, pos::Int64, len::Int64, ::Distributed.var"#165#167"{var"#1344#1348"{Vector{Vector{String}}}, Base.OneTo{Int64}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:92 │ [3] (::JSON3.WriteClosure{Vector{UInt8}, NamedTuple{(), Tuple{}}})(i::Int64, nm::Symbol, TT::Type, v::Function; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:122 │ [4] WriteClosure │ @ ~/.julia/packages/JSON3/CpNms/src/write.jl:113 [inlined] │ [5] foreachfield(f::JSON3.WriteClosure{Vector{UInt8}, NamedTuple{(), Tuple{}}}, x::Task) │ @ StructTypes ~/.julia/packages/StructTypes/AK4aM/src/StructTypes.jl:676 │ [6] write(::StructTypes.UnorderedStruct, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Task; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:133 │ [7] write(::StructTypes.UnorderedStruct, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Task) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:131 │ [8] write(::StructTypes.DictType, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Dict{Symbol, Any}; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:156 │ [9] write(::StructTypes.DictType, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Dict{Symbol, Any}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:147 │ [10] write(::StructTypes.DictType, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Dict{String, Any}; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:156 │ [11] write(::StructTypes.DictType, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Dict{String, Any}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:147 │ [12] write(::StructTypes.DictType, buf::Vector{UInt8}, pos::Int64, len::Int64, x::Dict{Symbol, Any}; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:156 │ [13] write │ @ ~/.julia/packages/JSON3/CpNms/src/write.jl:147 [inlined] │ [14] write(obj::Dict{Symbol, Any}; kw::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:39 │ [15] write(obj::Dict{Symbol, Any}) │ @ JSON3 ~/.julia/packages/JSON3/CpNms/src/write.jl:37 │ [16] process_callback(request::HTTP.Messages.Request, state::Dash.HandlerState) │ @ Dash ~/.julia/packages/Dash/yscRy/src/handler/processors/callback.jl:78 │ [17] try_handle │ @ ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:51 [inlined] │ [18] try_handle(route::Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_callback)}}, path::SubString{String}, request::HTTP.Messages.Request, args::Dash.HandlerState) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:97 │ [19] _handle │ @ ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:101 [inlined] │ [20] _handle (repeats 6 times) │ @ ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:102 [inlined] │ [21] handle(route_tuple::Tuple{Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_layout)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_dependencies)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_reload_hash)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_default_favicon)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.DynamicRoute{Tuple{Tuple{Int64, String}}, NamedTuple{(:path, :namespace), Tuple{Int64, Int64}}}, typeof(Dash.process_resource)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.DynamicRoute{Tuple{Tuple{Int64, String}}, NamedTuple{(:file_path,), Tuple{Int64}}}, typeof(Dash.process_assets)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_callback)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.DynamicRoute{Tuple{}, NamedTuple{(), Tuple{}}}, typeof(Dash.process_index)}}, Dash.HttpHelpers.Route{Dash.HttpHelpers.RouteHandler{Dash.HttpHelpers.StaticRoute, typeof(Dash.process_index)}}}, path::SubString{String}, request::HTTP.Messages.Request, args::Dash.HandlerState) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:112 │ [22] handle(router::Dash.HttpHelpers.Router, request::HTTP.Messages.Request, args::Dash.HandlerState) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/router.jl:129 │ [23] (::Dash.HttpHelpers.var"#1#2"{Dash.HttpHelpers.Router, Dash.HandlerState})(::HTTP.Messages.Request) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/handlers.jl:4 │ [24] handle │ @ ~/.julia/packages/HTTP/aTjcj/src/Handlers.jl:254 [inlined] │ [25] (::Dash.HttpHelpers.var"#7#8"{Dash.var"#68#70"{Dash.DashApp}, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#1#2"{Dash.HttpHelpers.Router, Dash.HandlerState}}})(::HTTP.Messages.Request) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/handlers.jl:48 │ [26] handle │ @ ~/.julia/packages/HTTP/aTjcj/src/Handlers.jl:254 [inlined] │ [27] (::Dash.HttpHelpers.var"#4#5"{Vector{String}, Int64, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#7#8"{Dash.var"#68#70"{Dash.DashApp}, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#1#2"{Dash.HttpHelpers.Router, Dash.HandlerState}}}}})(::HTTP.Messages.Request) │ @ Dash.HttpHelpers ~/.julia/packages/Dash/yscRy/src/HttpHelpers/handlers.jl:27 │ [28] handle │ @ ~/.julia/packages/HTTP/aTjcj/src/Handlers.jl:254 [inlined] │ [29] handle(::HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#4#5"{Vector{String}, Int64, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#7#8"{Dash.var"#68#70"{Dash.DashApp}, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#1#2"{Dash.HttpHelpers.Router, Dash.HandlerState}}}}}}, ::HTTP.Streams.Stream{HTTP.Messages.Request, HTTP.ConnectionPool.Transaction{Sockets.TCPSocket}}) │ @ HTTP.Handlers ~/.julia/packages/HTTP/aTjcj/src/Handlers.jl:277 │ [30] #4 │ @ ~/.julia/packages/HTTP/aTjcj/src/Handlers.jl:351 [inlined] │ [31] macro expansion │ @ ~/.julia/packages/HTTP/aTjcj/src/Servers.jl:415 [inlined] │ [32] (::HTTP.Servers.var"#13#14"{HTTP.Handlers.var"#4#5"{HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#4#5"{Vector{String}, Int64, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#7#8"{Dash.var"#68#70"{Dash.DashApp}, HTTP.Handlers.RequestHandlerFunction{Dash.HttpHelpers.var"#1#2"{Dash.HttpHelpers.Router, Dash.HandlerState}}}}}}}, HTTP.ConnectionPool.Transaction{Sockets.TCPSocket}, HTTP.Servers.Server{Nothing, Sockets.TCPServer}, HTTP.Streams.Stream{HTTP.Messages.Request, HTTP.ConnectionPool.Transaction{Sockets.TCPSocket}}})() │ @ HTTP.Servers ./task.jl:417 └ @ Dash ~/.julia/packages/Dash/yscRy/src/handler/make_handler.jl:61

[etjekant]

Also in png:

[etpinard]

Thanks for writing in!

In brief, the error stacktrace implies that your callback output value does not have defined method for lowering its content to JSON - the data format that Dash.jl used to return data from the Julia backend to JavaScript frontend.

I'm not familiar with @distributed outputs, but perhaps there's a way to define a custom lower method similar to

taken https://quinnj.github.io/JSON3.jl/stable/#Struct-API