Constructor ChoiceFieldData failed.

[NeroBlackstone]

I'm trying to generate julia types from musicxml 4.0 xsd schema.

ERROR: MethodError: Cannot `convert` an object of type XsdToStruct.GroupFieldData to an object of type XsdToStruct.FieldData

Closest candidates are:
  convert(::Type{T}, ::T) where T
   @ Base Base.jl:84
  XsdToStruct.FieldData(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any)
   @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_field_data/xsd_field_data_types.jl:9

Stacktrace:
  [1] setindex!(A::Vector{XsdToStruct.FieldData}, x::XsdToStruct.GroupFieldData, i1::Int64)
    @ Base ./array.jl:1021
  [2] _unsafe_copyto!(dest::Vector{XsdToStruct.FieldData}, doffs::Int64, src::Vector{XsdToStruct.AbstractFieldData}, soffs::Int64, n::Int64)
    @ Base ./array.jl:299
  [3] unsafe_copyto!
    @ ./array.jl:353 [inlined]
  [4] _copyto_impl!
    @ ./array.jl:376 [inlined]
  [5] copyto!
    @ ./array.jl:363 [inlined]
  [6] copyto!
    @ ./array.jl:385 [inlined]
  [7] copyto_axcheck!
    @ ./abstractarray.jl:1177 [inlined]
  [8] Vector{XsdToStruct.FieldData}(x::Vector{XsdToStruct.AbstractFieldData})
    @ Base ./array.jl:673
  [9] convert
    @ ./array.jl:665 [inlined]
 [10] ChoiceFieldData
    @ ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_field_data/xsd_field_data_types.jl:22 [inlined]
 [11] #ChoiceFieldData#2
    @ ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_field_data/xsd_field_data_types.jl:21 [inlined]
 [12] parse_xsd_complex_content_choice!(complex_node::XsdToStruct.ComplexTreeNode, xsd_choice::LightXML.XMLElement)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:108
 [13] parse_complex_content!(complex_node::XsdToStruct.ComplexTreeNode, xsd_complex_content::LightXML.XMLElement)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:42
 [14] parse_xsd_complex_content_sequence!(complex_node::XsdToStruct.ComplexTreeNode, xsd_sequence::LightXML.XMLElement)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:52
 [15] parse_complex_content!(complex_node::XsdToStruct.ComplexTreeNode, xsd_complex_content::LightXML.XMLElement)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:36
 [16] parse_xsd_complex_type(xsd_complex::LightXML.XMLElement, type_name::Nothing, sub_module::Nothing)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:193
 [17] parse_xsd_complex_type
    @ ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader_complex_node.jl:143 [inlined]
 [18] create_xsd_tree(xsd_root::LightXML.XMLElement)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader.jl:48
 [19] read_xsd(xsd_path::String)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/xsd_reader/xsd_reader.jl:15
 [20] xsd_to_struct_module(xsd_path::String, output_dir::String)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/XsdToStruct.jl:52
 [21] xsd_to_struct_module(xsd_path::String)
    @ XsdToStruct ~/.julia/packages/XsdToStruct/BGBoC/src/XsdToStruct.jl:88
 [22] top-level scope
    @ REPL[10]:1

It looks like the field is not being converted correctly:

https://github.com/Tom-Lemmens/XmlStructTools.jl/blob/c24a048ddce27506578a589092022ca5a2b41111/XsdToStruct.jl/src/xsd_field_data/xsd_field_data_types.jl#L23C5-L23C19

[NeroBlackstone]

I think proper exception handling code should be added. When an error is thrown, it shows which part of the xsd caused the exception.